>>14875501I'm
>>14875343 and you can check Xerneas/Yveltal's stats during the battle with Lysander.
As for it's IVs, I'm just going by it's max stats possible at that level with a Modest nature which are:
HP - 201
Atk - 135
Def - 115
SpA - 166
SpD - 118
Spe - 119
Hope this helps.