From: HanOfTheNekos | #021
Pokemon Trainer Red with Squirtle, Ivysaur, Charizard.
PT Gold with Totodile, Bayleef, Typhlosion.
PT Ruby with MUDKIP, Grovile, Blaziken.
PT Diamond with Piplup, Turtwig's second form, Infernape.
PT Black with Oshawott, Snivy's evo, Tepig's evo.
That's how you do alternate skins (except Charizard is the only flier, and the mid ones aren't all quadrupeds).
It's really obvious why this wouldn't work and is an awful idea
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Mer