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Xerneas vs Yveltal: which fits your team?

Neither has a base Speed or combined defensive-stat edge: both have 99 Speed and 319 combined HP, Defense and Sp. Def. base stats.

Their other base stats also tie. Typing, moves, abilities and battle format matter more than these numbers for a head-to-head decision.

Their listed type weaknesses do not overlap, so they cover different defensive gaps. Xerneas is weak to Poison, Steel, while Yveltal is not. Yveltal is weak to Electric, Ice, Rock, Fairy, while Xerneas is not.