You had ONE job Misdreavus.

So, Im playing Pokemon Pearl and im at the second gym, and its kicking my ass. My team is Prinplup, Luxio, Pachirisu, and Misdreavus. Terrible team for a grass gym, I know. BUT, Misdreavus knows Psywave, which SHOULD be super effective against poison. So can anyone tell me WHY its not super effective against Gardenia's Roserade? That Roserade is kicking my ass.