so you want it to be immune to a type it will already resist and gain a weakness to a type that can already tank it...somehow that doesnt seem like a good idea to me.I could se this pokemon get an ablility that makes it immune to Dark attacks (thinking mostly of those fishes living deep down under the water without any sunlight at all) and gives it a Poison weakness, it could be called "Pristine Darkness". The poison weakness would probobly not be so big, because of the rarity of Poison attacks (mostly due to all steel types in OU). Of the top 50 of the most used pkmn on the CAP server during november only three pokemon is of poison type: Fidgit, Gengar and Tentacruel, and I haven't seen any of them use Sludge bomb alot. I could see it get two immunities and become 4x weak to Poison as it would make it more counterable (probobly with alot more not OU pokes) and a good decentralizer of the current metagame.
edit @all those talking about a psyche up ability- have you considered how bad that could be? matching something like SD or tailglow will do nothing for you unless you can hit first. then theres the possible programming problems, the worst of which would be if those boosts didnt go away.



















