Poison really needs some Dark types...
Roserade
Type: Dark / Poison
Stats: 60 -> 80 (+20) / 70 / 65 -> 85 (+20) / 135 (+10) / 105 / 90 -> 101 (+11)
Roserade @ Choice Scarf
Ability: Natural Cure
EVs: 252 SpA / 4 SpD / 252 Spe
Timid Nature
- Sludge Bomb
- Dark Pulse
- Sleep Powder
- Dazzling Gleam
Roserade never really had too much going for it in Monotype, but now it turns into a reliable Psychic check, to help Poison in those ever common Psychic matchups. It now outspeeds every Psychic threat bar the latis, and pretty much all of them with Choice Scarf. Now immune to Psychic and with Dark STAB, it can reliably deal with the Psychic Pokemon that give Poison trouble. Just set up the Stealth Rocks or do some damage beforehand and let this monster sweep. If you don't feel that Roserade will OHKO the Pokemon, just slap a Sleep Powder on it. Psychics will run away at the sight of Roserade.

Roserade
Type: Dark / Poison
Stats: 60 -> 80 (+20) / 70 / 65 -> 85 (+20) / 135 (+10) / 105 / 90 -> 101 (+11)
Roserade @ Choice Scarf
Ability: Natural Cure
EVs: 252 SpA / 4 SpD / 252 Spe
Timid Nature
- Sludge Bomb
- Dark Pulse
- Sleep Powder
- Dazzling Gleam
Roserade never really had too much going for it in Monotype, but now it turns into a reliable Psychic check, to help Poison in those ever common Psychic matchups. It now outspeeds every Psychic threat bar the latis, and pretty much all of them with Choice Scarf. Now immune to Psychic and with Dark STAB, it can reliably deal with the Psychic Pokemon that give Poison trouble. Just set up the Stealth Rocks or do some damage beforehand and let this monster sweep. If you don't feel that Roserade will OHKO the Pokemon, just slap a Sleep Powder on it. Psychics will run away at the sight of Roserade.
252 SpA Roserade Dark Pulse vs. 0 HP / 4 SpD Victini: 270-318 (79.1 - 93.2%) -- guaranteed OHKO after Stealth Rock
252 SpA Roserade Dark Pulse vs. 252 HP / 4 SpD Slowbro: 320-380 (81.2 - 96.4%) -- guaranteed 2HKO
252 SpA Roserade Dark Pulse vs. 0 HP / 4 SpD Latios: 248-294 (82.3 - 97.6%) -- guaranteed 2HKO
252 SpA Roserade Dazzling Gleam vs. 0 HP / 4 SpD Mega Medicham: 204-242 (78.1 - 92.7%) -- guaranteed 2HKO
252 SpA Roserade Dark Pulse vs. 252 HP / 4 SpD Slowbro: 320-380 (81.2 - 96.4%) -- guaranteed 2HKO
252 SpA Roserade Dark Pulse vs. 0 HP / 4 SpD Latios: 248-294 (82.3 - 97.6%) -- guaranteed 2HKO
252 SpA Roserade Dazzling Gleam vs. 0 HP / 4 SpD Mega Medicham: 204-242 (78.1 - 92.7%) -- guaranteed 2HKO