Welcome to PokéCommunity! Register now and join one of the best fan communities on the 'net to talk Pokémon and more! We are not affiliated with The Pokémon Company or Nintendo.
Oh no, I wasn't thinking of brand new NPCs, but if you overwrote current NPCs that trade you pokemon? Like in Snowbelle City, a NPC will trade you a Bisharp for a Jigglypuff, but what if you made them give you a mythical pokemon (let's say Volcanion) for a hard to get pokemon (maybe Haxourous...
Ooo, I love this idea of a hack! I think you said that the only changes is all Vivillion forms available, but is there a way to get the mythicals also? I know it would be a lot of work, but what if a one time trade with an npc gave a mythical instead? Just a thought :P but thanks for reading