Baltoy isn't commonly used, most people over look him, so here's my set.
Baltoy w/ Evoilite
44 HP, 212 Defense, 252 Special Defense.
Ability - Levitate
Rest or Sandstorm
Baltoy is a fan favorite of mine.
Stealth Rock is your hazards, deals damage on switching in, ( I use this as a Lead ) and can do some major work going around.
Toxic is a pretty common move on Evoilite users, but it's how he does damage, both attacking stats are beyond pitiful.
Power Split will screw up anything that comes at you due to Baltoy's horrible attacking stats.
While Rest can give you some HP back and further stall Toxic, or Sandstorm can give you more damage slowly eating at your opponent.
So, Baltoy proves, " not commonly used " doesn't mean " not good ".