A man could say that this topic was inevitable. Just as winter is coming.
Put you pokemon ability ideas here. I'll go ahead and start us off with a couple.
Quickdraw- Gives +1 priority to this pokemon's weaker moves (base power 50 or less). Remind you of prankster/technician? It should. I was thinking of something like this for the rattlesnake CAP I was thinking of, but it could apply to other pokemon just as easily, like zangoose, seviper, arbok, etc.
Tracker/Hunter/Keen Nose/etc- This pokemon ignore's foes attempts at evasion, using special or heightened senses to pinpoint the target and prevents foes' attempts to reduce this pokemon's accuracy. For example, say we have a wolf CAP, this would go well with it. Or with stoutland, or some psychic types and predator pokemon (ex. snakes- dem Jacob's organs). This could reduce the complaints of evasion being too OP.
Nebulous Form- for ghosts, mainly. Pokemon has ... say an additional 20% of avoiding physical attacks, calculated into natural move accuracy. I can't remember if any ghosts learn double team or anything, but it wouldn't hurt if it didn't stack with evasive moves or baton pass. It would be whichever value is greater.