Tricky!

[bobojo10]

Banette @ Focus Sash
Ability: Insomnia
EVs: 252 HP/128 Def/128 SDef
Brave nature (+Atk, -Spd)
- Trick Room
- Protect
- Destiny Bond
- Shadow Claw
Use Protect to figure out which set the opponent is packing. Then Trick Room, from there use shadow claw if you think you can OHKO, if not use destiny bond. If you survive their attack protect and bond again the next turn.
---
Slowbro @ Leftovers
Ability: Own Tempo
EVs: 252 HP/4 Def/252 SDef
Calm nature (+SDef, -Atk)
- Trick Room
- Surf
- Psychic
- Grass Knot
A bulky Trick Roomer. Powerful, and great coverage. What more is there to say.
---
Marowak @ Thick Club
Ability: Rock Head
EVs: 252 Atk/60 Def/198 SDef
Brave nature (+Atk, -Spd)
- Earthquake
- Fire Punch
- Stone Edge
- Thunderpunch
If he comes in when TR is up, you better be runnung. He will OHKO most. He also can take a hit quite well.
---
Porygon2 @ Leftovers
Ability: Trace
EVs: 252 HP/128 Def/128 SAtk
Quiet nature (+SAtk, -Spd)
- Trick Room
- Thunderbolt
- Ice Beam
- Recover/Tri Attack
Defense based Porygon 2. Good and bulky, and can take down many offensive threats very well.
---
Dusknoir @ Leftovers
Ability: Pressure
EVs: 252 HP/252 Def/4 SDef
Relaxed nature (+Def, -Spd)
- Trick Room
- Will-o-wisp
- Pain Split
- Shadow Punch

Pretty much a smogon set here, but why mess with what already works.
---
Tyranitar (M) @ Life Orb
Ability: Sand Stream
EVs: 4 HP/252 Atk/252 SAtk
Quiet nature (+SAtk, -Spd)
- Dark Pulse
- Stone Edge
- Stealth Rock
- Aerial Ace
This way i have SR, and he also takes down many threats.

Any comments appreciated. Thanks!

 

[palingensia]

You have one too many Trick Room users, so that needs to be remedied. Also, Stealth Rock is on an offensive Pokemon, which is a waste. I'll give you a few tips on Trick Room, as you seem to be new to it.

Banette as a lead is fine, but it's beaten by many common leads. Protect is also a waste of a moveslot. I suggest you either use Jirachi or Bronzong as your lead, as both of them can set up both Stealth Rock and Trick Room whilst being bulky enough to take a few hits and come back later in the game. Jirachi is a nice Trick Room lead also for the fact that people don't expect it to be packing Trick Room.

Porygon2 is a fantastic Trick Roomer, but your EVs are slightly off. I use 252 HP/216 Def/40 SpA Relaxed, as that lets you better counter Salamence and Gyarados. Recover over Tri Attack always, you need to keep your Trick Roomers alive.

Shadow Punch is bad on Dusknoir, use Earthquake as that lets it beat Heatran (who otherwise walls it completely).

If you want to keep Slowbro, I suggest you use a CM set or switch to Slowking and use a NP set, as with three Trick Roomers already Slowbro is the easiest to convert into a sweeper. If you go with CMBro, use this set:

Slowbro @Leftovers
Own Tempo | Relaxed | 252 HP/252 Def/4 SpD
~ Calm Mind
~ Surf
~ Ice Beam
~ Grass Knot/Flamethrower/Slack Off

And as for NPKing...

Slowking @Life Orb
Own Tempo | Quiet | 252 HP/252 SpA/4 SpD
~ Nasty Plot
~ Surf
~ Ice Beam/Fire Blast/Grass Knot
~ Ice Beam/Fire Blast/Grass Knot

Both are good, but the faster setup of Slowking is usually preferred in Trick Room.

Marowak is fine, but consider using Double-edge over ThunderPunch as Earthquake or Stone Edge hit most Waters harder anyway. It also means you can hit Flygon.

Now you lack a revenge killer for when Trick Room is not up. If you like Tyranitar (and what's not to like, it has a Dark/Ghost resist), you can use ScarfTar (Crunch/Pursuit/Earthquake/Stone Edge), but you can also use Scarf Heatran in its place (it keeps the valuable Dark/Ghost resistances) as it is rather good too. Of course there are many other scarfers you could use, but generally ones which have a Dark/Ghost resist are the best to use.