Do you think a specially defensive Roserade set is viable, or should I just go with the Technician set? I've caught a few battle spot trainers off guard with it a few times

Roserade @ Black Sludge
Ability: Natural Cure
EVs: 252 HP / 252 SpD / 4 Spe
Calm Nature
IVs: 0 Atk
- Giga Drain
- Sludge Bomb
- Toxic Spikes
- Leech Seed