This is what I think.
Porygon-2@Evolite(as said above)
Ability: Download
Nature: Quiet
EVs: 252 S.attack, 128 def, 128 S.def
Recover
Trick-room
Ice-beam
Thunderbolt
Its kind of silly investing EVs in the defenses and giving him a focus sash so make him a Porygon-2 and Evolite and he is one of the best Tanks out there. Recover is obvious for healing and Trick-room is the whole point. The Bolt beam Combo makes this guy insanely useful as a T-room sweeper.
Rex (Granbull) (M) @ Choice Band
Trait: Intimidate
EVs: 252 HP / 252 Atk / 4 Def
Brave Nature (+Atk, -Spd)
- Frustration
- Ice Punch
- Fire Punch
- ThunderPunch
I must say this is great though I would replace this guy with Conkeldurr or Machamp because those guys are amazing with T-room but if you really want this guy then that is fine but if you want to use one of the Pokemon I suggested just look them up in the searcher and you will find moveset questions.
Mushey (Musharna) (F) @ Leftovers
Trait: Synchronize
EVs: 112 HP / 112 Def / 252 SAtk / 32 SDef
Quiet Nature (+SAtk, -Spd)
- Trick Room
- Psychic
- Shadow Ball
- Energy Ball
Great on paper but in practice Musharna is not very useful sadly. You can keep this but I would go with Exeggutor or maybe Glaceon both great T-room Pokemon also to find them just look them up.
Dusknoir (M) @ Leftovers
Trait: Pressure
EVs: 80 HP / 252 Atk / 88 Def / 88 SDef
Brave Nature (+Atk, -Spd)
- Trick Room
- Shadow Punch
- Thunder Punch
- Ice Punch
Excellant choice I use the same thing except I use E-quake instead of Thunder-punch but I like what you did.
OK great idea but this guy doesn't have the raw attack power to be a T-room sweeper. Go with..
Rampardos@Iron-ball
Ability: Mold-breaker
Nature: Brave
EVs: 252 Attack, 252 hp, 6 defense
-Stone-edge
-Earthquake
-Fling
-Brick-break/Thunder/Fire-Punch
This guy is the ultimate T-room sweeper a max 471 attack stat will OHKO almost every Pokemon in its way. Stone edge is for STAB, Earthquake is coverage, Fling is amazingly powerful with the Iron ball, Choose your coverage move for the last one.
Whimsicott (M) @ Leftovers
Trait: Prankster
EVs: 252 HP / 128 S.Def / 128 Def
Relaxed(+Def, -Speed)
- Trick Room
- Leech Seed
- Substitute
- Protect
Get rid of those Speed EVs they have absolutely no use on a T-room team especially when your Pokemon has all priority. He could use the extra defense boost from Relaxed. Great choice I never knew he could use T-rooom.
Overall you have a great well balanced team great job :)