Can we stop acting like ability clause wasn't suggested already two pages ago? The redundancy of the posts on this thread is just ridiculous. If TI is going to implement it, he will, but mentioning the same thing 8 times (8 different posts have brought up an ability clause) isn't going to make him any more likely to do so. You can show support with the post like button. Half of these posts aren't adding anything meaningful to the conversation.
As for the addition of an ability clause by inheritance, that's a great idea. That's an example of thinking outside the box to solve a common problem, and I very much agree with that.
I laddered for quite a while yesterday with a rather unusual team and came to some simple conclusions.
Swift Swim Keldeo was one of my first ideas, but it has been quite underwhelming. It doesn't hit hard enough to overcome typical bulkier mons in this metagame, and it lacks the ability to get past gale wings, making it seemingly mediocre. I used Manaphy as my setter - lots of bulk, u-turn, resttalk if you want it, etc. It's a great support mon in that role if you want to use rain.
Moltres>other gale wings users. Moltres just hits stupidly hard with hurricane and/or fire blast. A lot of common sweepers or gale wings checks just fall flat on their face to this thing because of its raw power off the special side. Hitting off of the special attack also gives it a completely different set of counters, and the ability to run a hidden power to get past checks makes it really, really threatening.
Scarf Serene Grace Metagross is quite scary. It's a straight upgrade over Jirachi in everything but the speed and u-turn, and it shows. It's a decent birdspam check, and the increased damage output helps it flinch things to death much more reliably. With that being said, however, losing u-turn really hurts. The speed drop is manageable, but the lack of u-turn creates a lot of 50/50s because you have to decide whether or not you're willing to potentially lose Metagross to flinch something to death.
As for other mons, I still don't know yet. Arena Trap Hippowdon seems pretty cool, as does Download Lopunny.