There are 10 rounds, in each of them it will tell you to find either Scratch Cat, Gobo, or Eevee (yes kinda random). You will have 10 seconds to find the character you're looking for. Use the mouse to uncover the characters and then click on the right one when you find it.
The eevee isn't mine, I got it from KyKoolKookie835's Pokemon Adoption Center. I just randomly made this.