I've realized that Swampert can be pretty amazing for triples. the one Im currently using has
swampert@Lefties
Careful
252HP/252 Sp.D/6Defense(or something like that
Toxic
Wide Guard
Mirror Coat
Scald/Bulldoze/Hammer Arm
Works amazingly. If you didn't know, Wide Guard protects from moves that hit multiple opponents, including moves you use yourself. I use it on the first turn long with a CB Exploder, which protects my Salamence, allowing me to get in a free DD. Also, you don't know how many D/Cs I've gotten after their lead tried to explode on me and I Wide Guarded it. Also works well when using moves like Earthquake and Surf, and is very helpful in protecting against rock slide, as well as EQs or Surfs from my opponent.
And also, God I ****ing hate Trick Room. not because my team can't beat it, but because It comes up SO MUCH. since I've started playing triples the other day, I've faced like 30 Trick Roomers. It Pisses me off that people tend to be too lazy to think of fancy strategies. I have a Dusclops on my team I've had since 3rd gen, and basically, it spams Calm Mind, then mimics my partners healing move(recover, Moonlight, etc..) for instant healing. Not a very offensive combo, but still.