Pokémon Maker Game

How to play the game "Pokémon Maker Game"?

Mary is one of the best Pokemon trainers around - she’s battled everyone and defeated the Pokemon League! She’s always travelling all over the world for battles and contests, and the other day in Johto she discovered a curious stone. It seemed to allow for custom evolutions! Mary quickly got her Eevee out of storage at the Pokecentre and rather than gaining another Vaporeon or Sylveon, Mary can create her own Pokemon! Help Mary design a new Eevee in this Pokemon game!