Obviously toss, Special Attack is too low imoBeen resetting for Xerneas in my X version, I got a Modest 201/135/115/162/118/119 which according to calc gives:
Xerneas - #716 (Modest)
HP: 30 - 31
Att: 28 - 31
Def: 30 - 31
SpA: 24 - 25
SpD: 30 - 31
Speed: 30 - 31
Keep or toss?