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Pokemon customization.
Like with the DNA ultra beast shit, another scientist in the vile theme, researches a way to control pokéDNA at will, so the you go getting piezes of data, a little bit of rattata a little bit of pikachu, a tail of slowpoke and so on so on.
so you make this soup of ingredients and the you get a mon of your own, "CREATE YOUR OWN POKEMON" and a lot of shit customizations fro type and random look generated on the DNA you get. but only you can make one per game.
similar how you can create mii fighter on smash, but for pokemon.