(Y/n's pov)
Ever since we were born Allister almost always depended on me, either for protection or as a shoulder to cry on when he was upset, but then two young trainers ignited a spark in him that pushed him to grow stronger. Battle after battle he and his Pokémon grew as did his self confidence. I wasn't needed anymore so I left him alone to run the Stow-on-side gym as I started my own journey. He didn't call, he didn't message me, my little brother was all grown up even if he was still so young, but one day I got a call from Melony about an incident. She called me frantic about something ordering me back to my home town immediately even if I was literally on the other side of the Galar region.

"Melony what's wrong? What could possibly be so bad that I-"

"Allister's caught a terrible fever and is having terrible respiratory problems!", my body froze in fear to the news but I continued to listen ordering my Mimikyu to find a Flying Taxi immediately, "He refuses to take any medicine we offer him even from his Pokémon. I need-he needs your help so please come back!"

I noticed Mimikyu scaring a Corviknight towards me with it's strange black claws and quickly rushed to the cab grabbing Mimikyu in the process,"Melony try to keep his temperature down I'll be there as soon as I can. Just focus on bringing down his fever !"

I begged the cab driver to hurry for my little brother but regardless I just knew it would take at least an hour to get home. The whole time the kind taxi driver would try to talk to me in order to calm me down but I just couldn't respond, Allister was always a very weak boy and if this fever was strong enough I was afraid that it would kill him.

"Allister was always so good getting himself into the trouble, ever since we were little he would somehow always be in the wrong place at the wrong time and I'd have to bail him out. The one time I leave him out of my sight and all of a sudden he's sick!", I groaned pulling on my (h/c) bangs.

I couldn't think like that I had to stay positive, Mimikyu distracted me with an Micle berry and my pestle. I had to stay focused if I gave Allister a spoonful of Micle paste it would make his medicine taste sweeter he'd have to take it then without a choice. I ground up the green berry while lost in thought about my little brother. Even if he was frail both mentally and emotionally he was still the strongest person I knew. He was my pride and joy because no matter what he'd prove why he was a gym leader with every battle. I loved him for that, no matter what he'd put up a fight and if he lost I'd be there to make him feel better, but now he was alone without me to help him. Mimikyu's black paw softly touched my face wiping away the tears that I failed to notice falling from my eyes.

"Sorry buddy I'm just so worried about Allister."

"Hey miss we're arriving in the city! We'll be in the gym in two minutes!", The taxi driver called.

"Make it one and I'll pay you triple the fare!", I yelled sticking my head out of the window to see the unlit gym.

Corviknight did as told and in less then a minute we had landed, I paid the kind taxi driver and raced inside the gym. The medical bay that's where they had to be! My feet ran on there own as it drawn to my little brother, I couldn't help but call his name as if he could hear me but his Pokémon sure could. The moment Gengar appeared I knew it would lead me to my brother, as soon as I arrived Melony's face lit up in joy.

"How's he doing?", I asked tossing my backpack off and tying up my hair.

"His fever kept rising so I settled Snom on his forehead but it doesn't seem to be helping. He won't take the medicine but during his sleep he kept mumbling your name so I thought maybe you could help?", the ice gym leader explained.

She was a mother she thought she could help but Allister was surprisingly stubborn when it came to taking his medicine. I kneeled down at the side of his bed smiling at his flushed face and gently took his sweaty hand in mine, he was warm extremely warm but I was here now.

"Allister, hey Allie? Allister I'm home, can you hear me?", I called softly squeezing his hand.

While taking shallow breathes his purple hues opened up to see me and I couldn't help but giggle at his little smile when he saw my face.

"Big...sis.", he sighed in a weak voice, "I...missed you."

"It's okay little buddy, I missed you too. I need you to take your medicine okay? Here eating this first.", I ordered giving him a spoonful of Micle berry paste to dry out his mouth.

As soon as he ate it I gave him his medicine which he quickly drank before takin in a cup of water. Melony was shocked by how obedient he was with me but she then understood, my little brother missed me so much that he got sick just for me to come back and help him. I carefully rested Allister down in the bed and raced off to get a towel and a cold bucket of water, little snom had worked so hard I'm sure it's belly was to warm for it now. I quickly placed a cold towel on Allister's forehead after combing his wet bangs back and covered him with a thinner blanket to keep him from overheating.

"Melony I can't thank you enough, I know he's a bit difficult but thank you for staying with him. I'll take it from here.", I smiled.

"Of course honey. Call me if you need anything okay, I left some dinner in the fridge in case your hungry or his appetite comes back.", Melony smiled softly giving me a warm hug before leaving.

I smiled and got comfortable in the med bay all of Allister's gym trainers came to support him wishing for his health to return and promising to keep the gym safe even as trainers came to battle for their badges. I smiled at their dedication to my little brother and scolded him a bit, "Why didn't you take your medicine sooner Allister? You've got everyone all worried for you."

Even in his sleep he still responded to my voice, "I...wanted to...see you...a-again."

"Me? Why? You don't need me anymore, you've gotten so much stronger than I have but you needed me? Allister I'm not any use to you anymore, you don't need me anymore you have friends and partners that love you."

"But I only have one sister.", he replied without hesitation, "After you left I battled hard each and everyday taking care of the trainers and my Pokémon while forgetting to take care of myself. You always reminded me to take care of myself but I forgot too and then when my body could no longer handle the strain...I-I fainted mid battle in front of everyone."

I gently hugged him close after his confession calling him a dummy in the process before taking my seat again. He turned towards me squeezing my hand lightly since he was weak and said it again, "I missed you. I was so afraid that I had lost you after you left on your journey, I know you're my big sister. I know that you should've been the gym leader but I took all that from you when I beat you at the cemetery and I hated myself for it...b-because I thought you hated me for it.", Allister confessed tears spilling from his eyes as he confessed his feelings to me.

I sat there in shock holding his hand softly as a smile creeped on my face, "Allister, I don't care about the gym. You are the strongest gym leader Stow-on-Side has ever had and watching you battle regardless if you win or lose fills me with so much pride. I have never once hated you in my life, you are my little brother although annoying at times I could never truly hate you. You are strong, talented, brave, and a damn well better trainer than I am. It doesn't matter who took over the gym because all of us know that you were meant to be a gym leader.", I smiled confidently wiping away his tears as my words continued to make him cry.

"I love you (y/n). What did I do to have such an amazing sister?", Allister cried hugging my hand to his face as I laughed at his emotional state.

I gently pressed a kiss to his round cheek and smiled at him, what would I do if I didn't have this dork in my life, "Allister thank you for being born and giving me the chance to be your big sister."

We stayed there together as I shared the stories of my adventures with him until eventually he nodded off thanks to his medicine. His breathes were still to shallow so I placed a nebulizer mask over his face to help him breathe better, soon enough he'd be back to his usual self and battling to his heart's content.

"(Y/n) we have an issue."

"Huh? What's wrong?", I asked the gym trainer didn't seem all to happy.

"Uhh a challenger made it to the final stage for the gym battle, but we don't have a gym leader. What do we do?"

I stood there in shock, how could we do this? Allister is far to weak to handle a battle, while I racked my brain for an answer I felt a tug on my shirt, it was my Mimikyu and behind it stood Allister's Pokémon. Gengar handed me a box and when I opened it I was presented with a gym uniform. I stared at Gengar in shock but it just nodded its head as if telling me yes.

"Tell the trainer...they're fighting for their badge but I'm not going easy on them even if I'm a substitute gym leader.", I smiled rushing off to change.

The stadium filled with screams and cheers and music but deep down only one fan's voice reached my heart. Down below in the med bay Allister smiled up at the ceiling hearing the crowd and giggled, "(Y/n), you're an amazing trainer and big sister, I know you'll win. You are the gym's pride and joy."