What people dot understand is that evolution in pokemon is not actual evolution, it's more like quick metamorphis because pokemon usually cacoon themself with light then evolve. Besides evolution takes millions of years to happen it's not going in a minute. Also evolution is cause by difference in genetics, for example a Zubat can be born with a slightly bigger mouth, so it's going to pass the genetics down, it's not going to make it a Golbat.
TL;DR: Pokemon evolution =\= real evolution
TL;DR: Pokemon evolution =\= real evolution