When posting in the uber definition topic I remembered this thread about the question why Species Clause is still enforced. I don't think it is a very necessary rule, especially not in DP where doubling up on one Pokemon with exactly the same defensive problems (whichever it is) leaves you vulnerable to even more things. I think the pros (surprise value between for example Mixmence and Specsmence) are compensated if not overridden by the cons (massive Ice weakness, in this case, as well as Stealth Rock etc). I would personally enjoy Species Clause being removed from Ladder Play as well as tournaments in the future, because I see no really convincing reason to keep it.