The whole "Nintendo might not accept new evolutions" doesn't seem to really be much of an argument point. In the "What is the Create-A-Pokémon Project?" announcement for this forum, it doesn't say anything about submitting Pokemon to Nintendo. As quoted from the first sentence: The Create-A-Pokémon project is a community dedicated to exploring and understanding the competitive Pokémon metagame by designing, creating, and playtesting new Pokémon concepts. In fact, Nintendo isn't even mentioned.
Even if we did submit our Pokemon to Nintendo, I'm certain that one being a new evolution of an existing Pokemon would be the least of our worries as far as acceptance goes.
I wouldn't say that a new evolution is really limiting, either (certainly not as much as everyone seems to think it is). As Gothic Togekiss just pointed out, some evolutions end up branching way off from their original forms; we've still got plenty of creative room to expand into. The only real limits we're working with by evolving an existing pokemon (especially since there are multiple pokemon we're considering evolving) is that the Pokemon will have to have the movepool of the pre-evo contained within its own and the fact that egg moves are already locked in.
Even if we did submit our Pokemon to Nintendo, I'm certain that one being a new evolution of an existing Pokemon would be the least of our worries as far as acceptance goes.
I wouldn't say that a new evolution is really limiting, either (certainly not as much as everyone seems to think it is). As Gothic Togekiss just pointed out, some evolutions end up branching way off from their original forms; we've still got plenty of creative room to expand into. The only real limits we're working with by evolving an existing pokemon (especially since there are multiple pokemon we're considering evolving) is that the Pokemon will have to have the movepool of the pre-evo contained within its own and the fact that egg moves are already locked in.