I think the pink background and border should be at like 25% opacity or less so it doesn't clash as hard with the white background. While leaving the Pokemon at 100% opacity, so that they pop up. The background shouldn't pop out like the Pokemon should.

EDIT: Making the not-Porygon one 75% or so opacity might give it a 3D-ish effect, but you might need to use drop shadows to accomplish that.