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Game nearly doubles the amount of existing megas. Starters are Snivy Litten and Totodile, which get regional evolutions instead of new forms, like how Cubone evolves in gen 7.
>NEW MEGAS
>Gen 1: Venusaur-X, Blastoise-X, Nidoking, Nidoqueen, Jynx, Kingler, Snorlax
>Gen 2: Noctowl, Ariados, Sunflora, Slowking, Magcargo
>Gen 3: Claydol, Chimecho, Zangoose, Seviper
>Gen 4: Luxray, Honchkrow, Roserade, Mismagius, Magnezone
>Gen 5: Scrafty, Krookodile, Leavanny, Gigalith, Zoroark, Vanilluxe, Chandelure, Haxorus
>Gen 6: Chesnaught, Delphox, Greninja, Pyroar, Malamar, Goodra, Noivern, Xerneas, Yveltal
>Gen 7+: Mudsdale, Toucannon, Turtonator, Greedent, Falinks, Boltund, Spidops, Scovillain, Dudunsparce
Mega Greedent apparently plays an important role in the post game with the squirrel mythical by hiding notes in its tail (?)