This is quite a solid team despite the weaknesses that you mentioned in the opening post. You are quite Mixmence weak (classic version) but you do have checks in Rotom and Mamoswine. In a similar fashion, Infernape gives you trouble, but you have ways to handle non-boosted versions (Rotom and Suicune).
Perhaps the biggest issue is Swords Dance Scizor, however. Since Rotom is the TrickScarf varient, it doesn't carry Overheat, I don't know if you will be able to beat it. Skarmory can only phaze it for so long before it can Swords Dance up and beat everything with Superpower / Bullet Punch. I don't particularly like Overheat on Rotom, but it could help this team over Rest. That, or Will-O-Wisp would be useful in some situations, because if you face a team of SD Lucario and CB Tyranitar, you should lose more often than not. I'd take Will-O-Wisp over Overheat personally.
Yeah, just keep Rotom alive or your team becomes too slow and bulky to keep up with the offensive threats of the metagame. I'd be really weary about Tricking the Scarf early-game as well, or you could have a lot of problems late-game. Congrats on reaching number one.