It can be caught in D/P/Pt.I received a Carvanha on GTS. Everything about it checks out, but it's in a Moon Ball and according to serebii's pokedex, it can only be caught on the Pokewalker. Does that make this Carvanha a hack?
I can't remember, do the games allow you to trade over HG/SS balls like the Moon Ball over to D/P/Pt? Or does the item get taken off/replaced?