Chris, Sonic, Amy, Y/N, and Shadow look at Final Mova, which has entered its second phase.

"It looks so strange. What is that thing?" Amy quietly asked.

Everyone looks on.

"Mother..." Cosmo said.

Tails looks at the readings of Final Mova.

"This doesn't look good! Its energy is increasing so rapidly... our scanners can't measure it!"

"Blast! The forestation process is getting too powerful for us to stop!" Eggman cursed.

Shadow leaps toward Final Mova.

"Shadow!" Y/N shouted.

"Let's help him." Sonic said.

Y/N nods, and flies toward the pulsating seed with Chris along who's in his ship.

"You better hurry!" Amy shouted to them.

"Ring Tunnel!"

Chris fires a line of rings.

"Go, Sonic!"

He leaps through the rings and impacts Final Mova, sending waves of energy all across its surface. Final Mova emits a purple-black gas that pushes him away, and the spaceship also. Not even Shadow wave of Chaos Spears can do any damage or Y/N's crystal magic. The purple gas surrounds them and knocks them away. Chris's ship crashes through a few of the palm trees. Amy flies toward the Typhoon.

"Amy!"

Sonic flies after her, catching her as they collide into the ship together. They land on the ground.

"Sonic!" Amy smiled.

"Ouch..." Chris grunted.

Shadow skids to a stop on the runway while Y/N stabbed the ground after she landed by the Typhoon.

~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

The Chaotix, Cream, and Rouge enter the bridge.

"We got all the Emeralds."

Vector and Espio present the petrified Chaos Emeralds.

"But look; they're useless now." Knuckles said, looking at them.

"Those poor Chaos Emeralds... All their power is gone." Cream sadly said.

"Chao chao..."

"That's just great! We don't have a single working Emerald! How can we fight back without extra power?"

"Eggman!" Tails called.

"Listen. According to my calculations, there's a chance we could restore the power of the Chaos Emeralds. However, it will take the energy of both out ships." Eggman said over the video.

Suddenly, Final Nova starts to glow a little.

"Doctor, something's happening!" Bokkun called.

Final Mova emits wave after wave of purple energy across the entire universe, instantly forestating all the planets that had their Planet Eggs removed. When hit by the wave, Amy starts to collapse.

"You okay?"

Plants start to grow on the Typhoon, and a strange energy surrounds everyone.

"I'm starting to feel weak..." Chris said.

Vector and Espio drop the Chaos Emeralds.

"What's happening, Tails?" Cosmo asked in worry to see everyone down.

"Dark Oak is taking the life energy out of our bodies, just like they did to all the planets they attacked." Tails answered.

"I feel sick." Bokkun groaned.

"He's even absorbing energy from robots. He's crazy." Bocoe said.

"I'm finished."

Decoe collapses.

"It's drawing in all life energy it can find to spread plant life across the galaxy. It's the last stage of the forestation process." Eggman said.

Only Cosmo isn't affected. Tails realizes this.

"Cosmo?"

Cosmo secures the dead Chaos Emeralds.

"Dark Oak cannot take my life energy away from me, because we both come from the same species of plant. I'll take care of this."

She leaves. Tails does nothing to stop her.

~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

Cosmo looks for a way to board Eggman's craft.

"I'll take these Emeralds to Dr. Eggman so he can restore their power."

She climbs the vines surrounding the Crimson Egg.

"The Metarex want to wipe out all animal life in the galaxy, but I still believe it's possible for plant and animal species to coexist in peace."

She remembers the party.

"Just like how I was able to become friends with them!"

She remembers Y/N.

"Dark Oak, I know you were watching."

A shot is shown of the Secco Inhabitants dealing with forestation.

"We're doing whatever we can to survive this journey."

A shot is shown of the Marmolims dealing with forestation by cutting down a tree.

"What we're doing isn't evil."

A shot is shown of Vanilla and other Mobians dealing with forestation as the entire planet is turned into a giant forest.

"Even if we're foolish, make mistakes and struggle... as long as we're alive, we can always try again!"

Deep inside Final Mova, Dark Oak speaks to Cosmo inside her mind. The singular eye of Dark Oak, as well as the eyes of Lucas, are shown.

"You cannot win... ... It's hopeless. What can one girl do to stop the Metarex?"

"Nothing you can say will make me give up! I have hope! Hope for a better future - a future of true peace!"

Sonic and Y/N uses all their energy to stand up.

"That's the kind of future my friends and I are fighting for!"

Suddenly, Final Mova emits a red wave of energy that causes one of the branches surrounding the Crimson Egg to grow and grab Cosmo, slamming her against the side of the Crimson Egg. There is a bright white light. Even after trying to tighten her grip, Cosmo's grip slips on the handkerchief containing the Chaos Emeralds, and they float away.

"The Chaos Emeralds!" she gasped.

Chris uses what little energy he has left to look up and see the Emeralds floating away. Sonic tries to move, but Amy holds him back. Shadow and Y/N are about to move as well when there is yet another glow from Final Mova. Final Mova appears to be vertically splitting in half. The weakness dies down.

"What's happening?" Knuckles asked.

"We've stopped losing energy." Tails said. "This light..."

The Chaos Emeralds glow from deep in space.

"It's because of the Planet Egg." Eggman said. "It appears the life force that the Metarex stole from the planets is responding to the Chaos Emeralds."

The Emeralds continue to glow. Cosmo is able to free herself from the vine and float down.

"Thank you..."

Tears of joy appear in her eyes as the Emeralds also float down.

"The pain is gone." Chris said.

"Look, Sonic, Y/N." Amy said.

The Emeralds finish floating down.

"Shadow!"

Shadow has a flashback of Molly and the memorial. He turned to see Y/N giving him a smile.

"You ready, sis, Shadow?" Sonic asked.

"Ready as I'll ever be, bro." Y/N grinned.

"All set. Let's finish this!"

They close their eyes and absorb the power of the Chaos Emeralds as Y/N's crystal glowed brightly, letting them turn them into Super Sonic, Super Y/N, and Super Shadow.

~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

Sonic, Y/N, and Shadow prepare to fight Final Mova. Cosmo watches. Cream and Cheese run outside.

"What's going on?"

"Y/N, Shadow, and Sonic are teaming up to stop the Metarex."

They fly inside the crack of Final Mova. Chris joins the others in the bridge.

"Sonic... Y/N... Shadow..."

They fly in and out of Final Mova, allowing it to finish splitting. It glows intensely.

"Yay!"

"Alright!"

Eggman is shocked as many clouds surround the area where Final Mova once was.

"Something is wrong. The energy levels are starting to reverse! Hm... It seems like it's imploding now."

The clouds move away. Now Final Mova has the appearance of a black planet. Phase Three has begun. Everyone is shocked.

"Foolish hedgehogs! With the help of the Planet Egg, you have indeed prevented me from transforming the galaxy..."

Sonic, Y/N, and Shadow float down to battle it.

"...but you can never win this battle. If the Metarex can't rule the galaxy, then we will destroy it!"

It pulsates with massive energy.

~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

The reading are off the charts.

"The pressure inside that thing is growing fast!" Tails exclaimed.

"What's Dark Oak tryin' to do?" Vector asked.

"I know. He's producting a huge gravitational force, because he's trying to crush the Planet Egg." Chris said.

"But why is he doing that?" Knuckles asked.

"Imagine it's like a big balloon, and you keep on squeezing it tighter and tighter. You know what happens sooner or later, don't you?"

"It goes bang!" Charmy finished with a smile.

"Hold on. Are you telling us that thing's going to explode?" Espio asked.

"I'm afraid so."

"That sounds bad." Rouge commented.

Cosmo looks on with dread as black energy pulses out of it.

"Dark Oak really is trying to destroy the galaxy."

Sonic, Y/N, and Shadow spin toward Final Mova and try to penetrate its energy, but it is so strong that nothing is done.

"Isn't there anything we can to to help break through that gravity field?" Bokkun asked.

"Well... I've got one plan that involves you robots, but you won't like it. When you were built, I put special self-destruct circuits inside your bodies in case of an emergency such as this. I could set you off to break through the gravity field."

"But Dr. Eggman, that would destroy us too!" Decoe said.

"And besides, that gravity field is really powerful, so it would take a huge amount of energy to break through!" Bocoe added.

"Good point!"

"Eggman... please don't carry out that plan." Chris said.

"Don't worry; I won't. The explosion wouldn't be strong enough to penetrate through the field."

"Don't you have another plan up your sleeve? We're running out of time here!" Knuckles shouted.

"You claim to be a scientific genius." Rouge shrugged. "This would be the perfect time to prove it to all of us."

Shadow starts to remove his limiters, but is stopped by Y/N. She shook her head not to do it. Y/N then looks at her brother, seeing as he's thinking of something. She sighed, knowing what to do in order to destroy Final Mova. Y/N grabbed Sonic's and Shadow's shoulder as her crystal began to glow blue. Sonic turns to her.

"Sis?"

Y/N gave both of them a sad smile before making them disappear. Sonic and Shadow found themselves teleported to the bridge with everyone else. Everyone is shocked to see them.

"Huh? Where's Y/N?" Amy asked.

"No..." Sonic gasped, running towards the glass window to see Y/N doing something as she stare at her crystal. "Y/N? Y/N!! Sis! What are you doing?!"

"Everyone, listen. I know what I have to do. I just wanted to let you know how much I love every one of you. I'm glad that I met you. Sonic, I'm proud to have you as my brother. When you see Sally, tell her that she'll always be my best friend." Y/N said with tears falling down as she smiles.

"No, Y/N!!" Sonic said, his voice wavering.

Shadow looks on shocked with a sense of fear and sadness.

"No... she's not going to..." Tails said.

Y/N glares at the Final Mova as her crystal began to glow very much more brighter than ever as her body begin to change. Once it stopped glowing, everyone started to admire her to see her in a wonderful dress they had ever seen. A pale yellow and white fabric covered in colorful stars with a large gem-like crescent moon in the middle. White and pale blue gem-like fabric covers the upper left corner of the chest, covered in pastel stars with the same fabric at the navel in the shape of four points. Sewn to the upper right corner of the chest is a blue gem on a gold base. At the bottom of the fabric is a frilly white strip that has a ruffled layer over it, adorned by gold stars and a bead chain. The skirt is in four layer, including one made from material resembling a cloudy sky, covered in an ornate gold design with a blue gem hear under it. The following layer is white with gold designs and gem lining, with a gold sun design at each corner that has sky blue stars on it. The scalloped layer under this is cloudy with light blue lining and an alternating gem design of crescents and stars. The last layer is white, thinner scalloping with gold lining and dots. Along the skirt layers are large feathery wings sticking out of the skirt, as well as glittering golden fabric bunched by a pale blue and gold ornamental chain with several star and crescent moon ornaments to match the detail on top of the fabric. A gold and sky blue gem chain also resides on each side. The user gains white opera gloves with ornamental design and a feathery cuff, along with a feathery choker with a gem necklace.

Golden sandals with a yellow flap on the foots heel lined with pearls. The toe strap is gold, attached to pearl and gold bead chain that holds a large, gem crescent moon. This chain, along with the one on each side of the foot attach above the ankle, connected to a star chain made from gold and pearl stars. Further up on the leg are white feathery wings wrapped around them.

A pearl blue tiara with a curled shape and dot design surrounding a large crescent moon that has a gold ornament hanging from its tip. On the moon are gold and blue gem stars, along with four sky blue gem stars. Pearl diamond studs are included with an emblem designed ornament, followed by three small chains, each tipped with a gold gem and with the middle chain extended past the two surrounding it. Included are golden feathery wings with a pale yellow and white base adorned in a gold design. Covering the wings are small golden gems and stars, along with beaded chains and large gem star and crescent ornaments.

In her hand is the sword made out of the same crystal from her necklace as it also has wings on her handle with a nice blue ribbon wrapped around it.

~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

https://youtu.be/JzNLZ37ZTZs

(A/N: This song was recomended by Aquarius from Quotev.)

"Sis..." Sonic said.

The certain people who are in love with Y/N blushed slightly to see her look good in that outfit. Cream looks on in awe and sadness.

"Y/N..."

Cosmo's amulet glows.

"Cosmo."

A shot of Earthia is shown.

"This is the moment we've been waiting for. You can help save the galaxy and our clan if you only believe in yourself."

"This is why I was sent here..." Cosmo murmured, looking at Y/N.

"Cosmo?" Cream called out.

"I understand now. There can be peace in the galaxy, and I have the power to make it happen, Cream. I have to help Y/N defeat him and create a future full of freedom."

"Cosmo?"

But she only smiles as she levitates into the air, amulet glowing.

"Cosmo! Not you too!"

Cosmo allows her amulet to break apart. She begins to enter her own stage of Mover Mode. The flowers in her hair begin to bloom. Cream and Cheese return to the bridge to report the news.

"Cosmo... Y/N are..."

Cream is really crying now.

"Cream? What's wrong?" Tails asked in worry.

"Cosmo and Y/N are..."

Never before has Cosmo looked more beautiful, with blooming roses and a mature appearance. Y/N sees this and sadly smiles. Cosmo smiles back and grabs her hand as they fly toward Final Mova.

"Mother, I feel really happy now because I finally know what my purpose is!"

Cosmo easily penetrates the energy field with the help of Y/N's crystal sword she had swung.

"My friends mean more to me than anything. That's why I give up everything to save them. I know Y/N will do the same."

Cosmo lets go of Y/N's hand, making her stare at her with hesitation and worry. She just smiles at her and gives her a kiss on the lips. This shocked Y/N before Cosmo flies away and begins to merge with Final Mova as it glows brightly. A single rose petal floats by.

Sonic begins tearing up as he watches Y/N stand in front of Final Mova as everyone else watches in tears. Shadow surprisingly cry a little as a single tear drop down to the ground. A beautiful cherry tree with many cherry blossoms appears atop Final Mova, it roots spreading halfway across the artificial planet.

"Cosmo, you can transform and pass through the gravity field. In your new form, you will be like me. Your destiny will be fulfilled. You have the power to stop Dark Oak, and bring new life to our clan." Earthia said.

Everyone is surprised. It spouts a few rose petals outward. One floats near Y/N. The spirit of Cosmo appears.

"It's all right. I have Dark Oak immobilized. Now you'll be able to destroy the Metarex and save the galaxy. Don't worry about me. Just finish me."

Y/N tears up, knowing what's going to happen to her.

"Don't cry, Y/N. We'll be together once we finish this."

~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

"She fused with Dark Oak. And Y/N is going to bring out all of her powers." Chris said.

"Cosmo... Y/N..." Amy said, her voice sounding like they're going to break at any minute.

"They're intending to die?" Vector quietly asked.

"No..." Espio siltently said.

"Dr. Eggman..." Bokkun said.

Eggman said nothing, feeling like he's going to cry too that his enemy is willing to die. It won't be the same with him taking down Sonic without Y/N.

"I'm afraid they will die... Once Y/N strikes, death will take her too."

"No... He's lying, right?" Charmy asked.

"We can't let it end like this! There must be some other way to save Cosmo and Y/N and stop Dark Oak! Chris!" Knuckles shouted, not wanting to believe his love is going to die.

"Sorry..."

"Sonic?"

Sonic said nothing as his body shook, ready to break down. Tears form in Amy's eyes.

"What are you talking about? You're going to let Cosmo and Y/N die?" Knuckles asked.

Tails is tearing up.

"That's enough! You're not the only one in pain! We all feel the same!" Rouge tearfully shouted.

"There's nothing we can do about it..." Sonic said. "This is her choice. We have to trust her."

Everyone went silent. Y/N brought out her crystal sword and pointed at Final Mova/Cosmo. Cosmo just smiles, looking ready. Y/N closes her eyes and several flashbacks comes. Y/N and Sonic taking down robots, Y/N and Tails fixing the X-Tornado, Y/N and Knuckles swimming in the cave, Y/N and Rouge hanging out, Y/N singing to Shadow, Y/N and Espio fighting Emerl, and Cosmo and Y/N looking up at the moon.

"I'll miss you, everyone. I love you all."

Y/N's crystal sword glowed along with her crystal necklace as she brought it up in the air. She let out a battle cry and swing her sword down as the flash of white flew toward Final Mova and Cosmo. Y/N manage to destroy Final Mova, Dark Oak, and the Metarex once and for all as it left a slash like cutting an apple. A few more cherry blossoms float by. Y/N's crystal starts to crack from using all of that power she brought out before they shatter into pieces. She could see darkness taking over her vision as she let out a last breath before she died. Her golden armor and sword disappeared as she's back into her normal bodysuit, except her body floats as she's completely lifeless with her eyes closed.

Sonic's eyes widen in fear and devastation as he sees her body floats unmoving.

"Y/N!!!!!!!"