Most of the names seem to be based of a simple word that we as little kids could have better understood
or you could say Gamefreak was lacking in the creative side, but honestly some of the names are more creative than the actual names i.e. Mr. Mime, I mean come on, "Mr.Mime"? thats the best they could do?
the best part is that female Mr.Mimes aren't called Ms. Mime, get it together Gamfreak
another example is voltorb
not very creative