Technically, the stuff that happens in Pokémon isn't evolution, so much as a sudden mutation or maturation caused by anything from extreme training to an increase in something in their bodies caused by happiness or an external stimulus (eg stones, being transferred from one trainer to another via electricity)
When my hush class was discussing about Social Darwinism being applied to the theory of evolution in a laissez-faire economy, I asked my teacher about pokemon. I said if the Charles Darwin was still alive, could he sue the pokemon industry? My teacher said pokemon was out of her generation... :l oh and the entire class moaned and groaned LOL
Technically speaking, considering how raising works, you could say what pokemons do actually IS evolution, only Lamark's theory of evolution rather than Darwin's.
My then seven years old niece saw that I had a Darwin plushie (it's adorable) and asked me who it was. "Oh, that's Darwin. He was a scientist who came up with smart things like evolution and stuff". She contemplated this, and then asked "You mean like pokémon?"