Originally Posted by Fat Syberia
There is no game mechanic preventing you from using multiple forms on the same team as it is, or even multiples of the same species (hell, gym leaders do it all the time), so I don't see how it's a contradiction one way or the other. The supporters of in-game adherence have only ever said that we should follow mechanics, not rules.
The mechanic is that you can't even start a battle with multiple forms on the same team. We would be breaking game mechanics by even allowing users with multiple forms to challenge people, since that is impossible within the confines of the game.