So, I'm playing Pokemon Showdown and I make a venusaur. Its moveset it Weather Ball, Solarbeam, HP ice, and Giga Drain (bad moveset. ik.). I go to search for a battle and it says Weather Ball is incompatible with another move. I dont get it! Solarbeam is from TM, Giga Drain from move tutor, and Hidden Power from TM.Why can't I use Weather Ball?!