Immunity
No Competitive Ability
The other ones arent even worth putting after..
Suction cups for one, frankly sucks balls. I understand the reasoning, and it is painfully obvious to me, that the only reason it could be of use is because of damn Skarmory. I absolutely do not want CAP2 to be tailored specifically because of a single thing in the metagame, that is just going down the path of giving it powerful priority to deal with excadrill, or making it the perfect dragonite killer etc..
Limber would be ok, but it's just so mediocre and useless because the only thing you commonly see paralyzing is ferrothorn/haxrachi/drawing a blank. The wonderful thing about CAP2 is that it can choose not to care about speed being cut, because it can run bulky but powerful sets as a tank. Or opt to be powerful and super fast to sweep away things before they can paralyze.
Immunity almost was my choice for second after no ability, but I realized that it is needed partially. If you are running any set besides sweeping and sacrificial, you want to not die to the first fat bitch that wants to sit there and coward out for twenty turns healing (e.g. blissey). Immunity is very useful for a bulky or support set because you can last. Blissey suddenly can only paralyze you, and you dont care because you are bulky. Toxic spikes while the least common hazard, is still a viable entry hazard, and avoiding it is very useful. It allows more than just speedy offensive sets to be used.
No competitive ability is my second choice, because frankly there are mostly terrible/useless abilities chosen right now, and CAP2 has whatever it could dream of with perfect offensive/defensive spread stats and one of ANY move in the game. It really could function without an ability, and opinionated, I think it would be pretty cool to have the first CAP with no competitive ability.