Ok so in game I ask people if Gengar is Sp. Atk or Atk. - everyone says Sp. Atk, Gengar is ghost/poison though. I'm just a little bit confused. Even though his moves are physical, I should raise Sp. Atk? Because I ask people what the best nature is and they all say Modest. I see that his Sp. Atk base is 135. What I don't get is why this base stat would effect his moves(which are physical)