It can't switch in though. Rotom heat deals with these well. Bulky variants have good synergy as well. Anyway, has anyone used SubSplit rotom h? It sounds p cool imo.
There's always my Charge beam set which i really love. While Rotom-H has sucky HP, it's nice Defenses give it just enough bulk to abuse Pain Split while not being so ultrafrail.
I've tried subsplit, but the thing is- if you use Overheat, you have to switch out, hence setting up sub becomes a neusience (fuck spelling btw). And if you opt to use HP fire (lol), you're literally getting half the power. (I've tried it- even with a couple Charge Beam boosts, it's totally not worth it) and like I said earlier about Rotom's bulk - if you use sub at the wrong time, you can be easily screwed.
But Subsplit is always a cool strategy and I suggest working with it if you're interested- Rotom-H is one of the most tweakable UU pokes imo.
My fave set:
HM?? (Rotom-Heat) @ Leftovers
Trait: Levitate
EVs: 252 SAtk / 4 SDef / 252 Spd
Timid Nature
IVs: 2 Atk / 30 SAtk
- Charge Beam
- Hidden Power [Grass]
- Overheat
- Pain Split
How it works: Come in on something that is scared to death of Rotom-H. Instead of using the superexpected Overheat, use Charge Beam. You'll most likely get a boost. If not, pretty much keep spamming Charge Beam. After a boost or two, (or more if easily possible) utterly destroy something with Overheat. now, the SpAtk cut doesn't hurt as much! And also Overheat is more spammable. HP Grass is for Swampert/Rhyperior- can be switched for various HPs I would think, but preferably don't lower your speed. 86 base is a pretty nice benchmark for Hera/Nidoking/Kingdra. Pain Split allows you to take a resisted/neutral hit and then cut down your opponent's HP. Out of personal experience, this set can take on many things 1v1, like Snorlax, CM Raikou (although it has to be in, + a little luck), or even Porygon2 depending on set. It doesn't always win, but it definitely makes it easier for the rest of your team.
I don't use shaymin that often, but I would think that the two would have nice synergy.