There is one reason I use Mega Beedrill, not Mega Scizor. I CAN'T SEEM TO USE IT RIGHT!! Whenever I use him, something has HP Fire, (same goes for Beedrill...), and I know Mega Scizor outclasses Mega Beedrill, it's just I've gotten used to Mega Beedrill, and have never used Scizor OR Mega Scizor...