It doesn't work? Damn, it sounded so cool with the 3 types and the super powerful last hit. :/That round strategy doesn't work, because round only increases in power once. I tried it with the proposed setup and after greninja hit and gardevoir went right after him with priority, aurorus lags behind with his sucky speed and gets KO'd before he can use a 90 bp refrigerated round. I had to find out after EV training him...
Maybe the idea is still salvageable with a setup like Mega Gardevoir - Aurorus - (some 4x ice resist). 120 STAB * 1.3 ability boost (it gets that right?) still sounds pretty good to me, although it's probably still worse than the cliched weather + spread move teams. You'd still be weak to steel though. Just throwing out an idea. I have no real knowledge of doubles/triples but I want to go in with something that I think will work at least.
Destiny bond on Gengar is great in the super singles IMO, especially if you have a sash. It's saved me a ton of times against mons my other two couldn't beat. It allows you to run more coverage than you could with sub/disable too, but I'm not really sure what you can't beat anymore without sub/disable. I wouldn't even touch focus blast when your streak is so reliant on consistency, despite the coverage it gives, but I guess that's up to you. I've been running dual stab + dazzling gleam + destiny bond and it works well enough for me.I was wondering if any changes are worth making, such as if Destiny Bond is worth using on Gengar.