[MunchkinMan]

The wording of Pukachu is a little different, offering us the window to say you can decide to discount your bonuses, as long as you don't have a helper. Hydrogen Dragon basically says, "If a certain condition exists, here's what happens instead." I wouldn't say those are the same thing, and therefore you can't decide, once the Monster is revealed, to not use something that would meet the specific conditions on the card.