this is just a bit theorymoning i guess since im about to post a set which i havent tested out due to lack of time. there are three pretty good offensive water types in the tier, and since you obviously dont want a defensive simipour you have to run a offensive set which takes advantage of what Simipour has over these three pokemon. im talking about Samurott, Ludicolo and Gorebyss. where gorebyss and ludicolo serve as rain sweepers (the former also as set-up sweeper), samurott is pretty similiar to Simipour, with good attacking stats and a similiar movepool as well. also, gorebyss and (special) samurott struggle somewhat with Regice, something that Simipour can take care of with Superpower.Simipour has one big thing over all these three, which is a good immediate speed. anyways, here is the set. the idea of it is taking advantage of simipours awesome speed which can be used to revenge frail sweepers while still being capable of dealing with stuff like regice which more than often is a full stop to special attackers (it still misses out on licki though

). its a mixed set featuring Superpower:
Simipour @ Life Orb
Trait: Torrent
EVs: 208 Spd / 68 Atk / 232 SAtk (if you
really want to outspeed Charizard, you can run max speed, and run Hasty Nature)
Naive Nature
- Superpower
- Hydro Pump
- Ice Beam
- Taunt (filler)
the EV spread is in such a way that it outspeeds every unboosted base 95 and below. like mentioned earlier you can run max speed to outspeed base 100 and below, but you'll lose some much needed firepower. this set safely 2HKOs standard/offensive restalk regice, who will try to grab a switch in to absorb those hpumps and KO with t-bolt. this means that its not really safe to bring it in on regice unless it has some prior damage, or otherwise you'll end up with a dead monkey. it's worth nothing that this set OHKOs and outspeeds sawsbuck with superpower, as ice beam does 80% of the time (the point is that it outspeeds and KOs sawsbuck

). hydro pump is still a really great move even without positive nature, as water moves an are awesome offensive typing in this meta and hpump gets boosted even further when simipour is below 33%. most offensive mons wont like to switch in on hydro pump. ice beam is usually a must for coverage, and the last moveslot is up to you really. she has numerous usable moves, including knock off which can be really annoying to multiple things like eviolite users, grass knot/hp grass for better overall coverage (namely Alomomola though), or in my case Taunt, which makes it annoying for things like Musharna and Alomomola.
if someone has time, maybe you can experiment with this set a little bit, like i said earlier i havent tested it out so sorry in advance.
i gotta go now, maybe ill ad some more later if i've tested it myself.