Your mother ( Dr Greenberg ) is working with Pokémon fusion and she is the lead scientist in this field/study of fusion. One day when you are at the lab you enter a room and you see a Eevee ( your favorite Pokémon ) as you go to pet the Eevee you hear a mothers voice from a speaker saying get out of there quickly before the fusion machine starts. You try to leave but the machines active and you see a bright light and when you wake up, you are now part Eevee.