>>48106057probably not the worst, but holy fuck trying to use this thing in HGSS is painful - Yanmega's attack is pretty mediocre, sub 80, and add on to that how rare Heart Scales are for pitiful BP physical moves. I was using one recently and the best moves it had until fucking Kanto were Silver Wind from TM and Ancient Power. Even then, it only got OK with Giga Drain by TM which is only 60BP in gen 4
