Jacob was now training with some of his pokemon including his newly evolved slowbro and pidgeot

Slowbro: male

Pidgeot: male

Coincidentally all the pokemon that were out could mega evolve. Just then Arceus came out

Arceus: hi son

Jacob: hey dad

Arceus: I see you're traing with your pokemon

Jacob: yep, always gotta be in top conditions

Arceus: thats right, now listen there something I want to give you, I was planning on give to you later but I think this is the perfect opportunity

Arceus then handed him this

Jacob: woah is that

Arceus: that's right, you now can mega evolve your pokemon

Jacob: wow

Arceus: yep, you'll also gonna need these

Arceus handed him these items

Venusaurite

Charizardite X

Charizardite Y

Blastoisinite

Beedrillite

Pidgeotite

Alakazite

Slowbronite

Gengarite

Kangaskhanite

Pinsirite

Gyaradosite

Aerodactylite

Jacob: thank you father but um, doesn't mega evolution sometimes harm the pokemon

Arceus: don't worry son, that only happens if your pokemon is not trained enough, but your pokemon are trained enough

Jacob: alright, lets try it