Yes all poison moves are physical attacks which means the more attack a Pokemon has the more it will hurt. Though if your facing a pikachu with static and you use sludge bomb on it you will NOT be affected by static.
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Sludge bomb: team rocket HQ (island 5)
inside the rocket warehouse on the fifth island.
You can get the Sludge Bomb TM in Route 43 or you can buy Sludge Bomb at the Battle Frontier.
The two really good move it will learn on its own are sludge bomb and screech. You can also give it TMs that are ground and poison type.
You find the sludge bomb, team rocket HQ on island 5.