Well in this year's VGC, a lot of trainers used both Thundurus and Tornadus at the same time. In fact, one trainer had these Genies and he won the tournament. Prankster is a really good ability. People like to use both Genies, to abuse the other team.
Well, I already have many Ice Beam users and an Ice Punch user, so there's no need for HP Ice. But, one tip I might use is Toxicroak Life Orb. Surf has more coverage than Hydro Pump, and if it does hit my Pokemon, they won't take that much damage because of their type.
I appreciate you rating and commenting though!
If you have another Pokemon I can use besides Toxicroak that would be nice.