This looks pretty fun. :D
Now, I'm terrible at pokemon but specially defensive Registeel has been working well for me so far. It can take a lot of punishment from all the psychics\Kyurems running around. I considered Cobalon at first but the extra defenses and psychic resistance really helps.
Victini is a motherfucker, especially CB varieties, so I opted for a Life Orb Lonely Houndoom with Flash Fire. It works surprisingly well versus a lot of things, and it completely shuts down Victinis. Pretty reliable revenge killer so far.
I use Crobat as a lead and it's working out.. decently, I suppose. It can deal deceptive amounts of damage and has access to U-Turn and Taunt which is nice.
I use Claydol to set up rocks and support my Houndoom\Victini with spin, and it's not bad at all. Not as good as it used to be back when I actually played in third gen, but it has a cool typing and decent bulk.
I use scarf Hera to clean. It's really good. Been seeing more toxic spikes lately, which he loves.
Biggest threat so far for me has been Azumarill I think, but that's my team's fault.
Really promising metagame and I'm enjoying it a lot so far.