I made my best singels streak with scarfed Darmanitan and the dmg output is really over the top.Most of the time you just Flare Blitz through teams so it´s really fast to get through a set of 7 trainers. You have to pair it up with a defensive mon because after a while you have to use U-turn more often. Usually you get attackt with water and ground moves so make sure you have something that resists.
Darmanitan, Suicune, Scizor
Holy crap I didn't even see your streak on the list lol.
I was thinking of teaming it up with Rotom-W, who has served me well on other teams. It has good bulk and resists water and ground. It also has volt switch which I see being useful for getting Darmanitan in for free if I have to U-turn out at the start of the battle. I'll probably just use Latios as my third member unless I can think of something else.