[img]http://new2.fjcdn.com/comments/Ash+s+charizard+was+shown+to+be+short+compared+to+others+_86f362b6bbbe2e54fecee1c3688fbc97.png[/img]

Well I still believe in Size differences being a thing in Pokémon even among the same species of course xD. 

And Skitty can produce eggs with Wailord too...

So that's a thing in pokémon logic.