Forretress is a good one. High Defense, good HP, though low S.Defense. He can learn Rapid-spin and ALL the entry hazards. He also has Sturdy.
EVs: 252 S.Defense, 200 Defense, 58 Hp
Rapid-spin: Spin the hazards away
Spikes/Toxic-spikes/Explosion: Hazard or BOOM
Donphan is good, great Defense and HP, though again not very high S.Defense. Has Stealth-rock and Rapid-spin.
EVs: 252 Attack, 200 S.Defense, 58 Hp
Ice-shard/Stone-edge: Priority or Coverage