Swampert wants these EVs: 240HP/216Def/52Sp.A Relaxed
The Sp.A is there to OHKO Naive Salamence.
I suggest trying Trick > Will-o-wisp on Rotom to help vs. Stall.
If Scizor isn't working for you, that's because he isn't Choice Banded. Take the CB off of Snorlax, give it to Scizor, and run the...