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You don't need one, but it's advised that you take one as it provides an extra level of power and a potential wincon. Also, a lot of teams will be running one, most likely either Mega Kangaskhan, Mega Charizard Y or Mega Salamence. If you still don't want to take one, you'll need a counterplay to the most common megas in the format (and by that regard, the most common picks).