Steel a great type to work with. I had a Steel Gym last year that I really liked. What did you have on your Poison Team ?
Lead: Crobat
Timid - Focus Sash - 252/252
Air Slash, Heat Wave, Taunt, Super Fang
Sp Atk: Gengar
Timid - Choice Specs - 252/252
Shadow Ball, Thunderbolt, Focus Blast, HP Ice
Atk: Nidoking
Adamant - Life Orb - 252/252
EQ, Ice Punch, Thunder Punch, Super Power
Def: Drapion
Careful -Battle Armor -Black Sludge - 252 HP / 200 Def / 56 Sp Def
EQ, Crunch, Toxic Spikes, Whirlwind
Sp Def: Roserade
Calm -Natural Cure- Sitrus Berry-236 HP / 160 Sp Def / 112 Speed
Leech Seed, Energy Ball, Spikes, Substitute
Rapid Spinner: Tentacruel
Bold - Liquid Ooze - Leftovers -252 HP / 252 Def
Rapid Spin, Surf, Ice Beam, Giga Drain
Ran that set in a DS league back when I first joined serebii. there were barely any people that could beat it.