Minority Suspect, I know that isn't the sole reasoning, I even specifically said "Nominating Xerneas for A+ rank, mostly because Xerneas is an adorable Pokemon when you think about it, and giving it Mid B rank isn't really that sufficient. It is a really cute Pokemon who has it's benefits from it's color coordinated antlers, all the way down to it's bright white legs. Even it's official sprite looks elegant and noble!"
I get that it was ranked low for being a distant nuisance, but this is a Cute-Ability thread, not the official viability rankings thread, even though we do need to put that into consideration.