I don't change Pokémon form, so it shouldn't change in bank, however I don't add the particular forms in the Pokédex.
I see, thanks.
Didn't try with unowns (because it's freaking useless^^), but other things like sancoki/tritosor (the pink/blue slugs that I don't know the english name of^^) keep their forms through bank so uknown should too.
thanks~