I made a trick room counter core because I got rekt by a couple of trick room teams:
Gengar @ Black Sludge
Ability: Trick Room
EVs: 252 SpA / 4 SpD / 252 Spe
Timid Nature
IVs: 0 Atk
- Sludge Wave
- Focus Blast
- Shadow Ball
- Trick
This is good, both for shutting down trick room...