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Your starter options are Dratini, Bagon, and Gible, with your rival using Frigibax. Mega Evolution is the only combat gimmick, so all of the starters will have their stones available. The dex of the game is pretty much just Kanto, Johto, Hoenn, Sinnoh, and Kitakami’s dexes with very few from outside of them, namely Baxcalibur and Zarude.
Every region / zone listed is guarded by a mythical that the Mythosphere will guide you to, as well as reveal mega stones for.
Kanto - Mew, Mega Mew turns white and has purple orbs on its hands, feet, and stomach
Johto - Celebi, Mega Celebi has colorful flowers blooming from its head, and its body becomes long and twisted like a rose stem
Hoenn - Jirachi, Mega Jirachi’s ribbons turn very long with inscriptions on them, its eyes are all open and glowing
Sinnoh - Arceus, Mega Arceus turns black with the structure on its back turning into three prongs that resemble Dialga, Palkia, and Giratina
Sevii Islands - Deoxys, Mega Deoxys looks like a fusion of all its forms, hard to describe but very mecha and cool
Fiore - Manaphy, it becomes very feminine and humanoid, with its egg on its chest and big eyes
Oblivia - Shaymin, specifically the base form gets the mega, it gains Fairy type and becomes really long with a flowery hedge maze on its back
Almia - Darkrai, its mega has already been shown
Kitakami - Pecharunt, its mega keeps its interior the same size, but the two peach arms turn into halves of a ghostly dragon head
Zarude - it gets armor made of vines and a pink mask over its face
No more new megas, no more new pokemon, any mythical not listed here does not appear in the game
