Mega Altaria, Mega Lopunny, and Mega Salamence are confirmed!

Mega Altaria is Dragon/Fairy with Pixilate

Mega Lopunny is Normal/Fighting with Scrappy

Mega Salamence is Dragon/Flying with Aerialate

Also, trainers will at least receive an alternate outfit while participating in contests! A trainer named Lucia is also revealed as an idol who scouts the player for contests. She apparently has an Altaria, and is probably the one who will give you the Alterianite.

Finally, it is revealed that the trainer will receive and shiny Beldum at some point during their journey! Again, this is presumably from Steven Stone, and probably at the same time he will give you the Metagrossite, but that’s not confirmed.