As simple as can be.
Team comp:
Two HH Blackfuse bombling (1/2/1)
One PP Emerald Proto-Whelp (2/1/2)
Breeds are probably important. I've only really tried it with those.
Same strat for almost everything except a few :
Flame jet-Explode
Flame jet-Explode
Heal up and survive the fel corruption until you can take the secondary pets out
Against mechanical ones you need to kill them twice so you might be forced to use burn a bit. Thankfully, both flame jet and burn are strong against mech.
Against felsworn sentry, you use flame jet, and spam burn until he repairs, then you wait until you can do a 2nd flame jet and you blow explode. Second blackfuse, you flame jet, and spam burn until he dies, then you explode on his rebirth. Or you can flame jet, swap, flame jet, spam burn.
Against Skrillix you obviously don't blow explode on the dodge...I prefer to skip the first flame jet and just explode right away first round with first blackfuse.
You sometimes have to adapt your strat a little based on the type of pets you're facing. But it's fairly straightforward.
Only time I wasn't able to kill one of them was Skrillix with double snakes. Snakes...I hate snakes. Otherwise expect a 95% win rate. Only thing you want to do is try to kill the main boss before 2nd corruption but not too early. Sometimes, it might be worth delaying explode by a round to reduce the fel corruption time.