>>34684623Because it's a prematurely-hatched embryo with no combat ability. Mega Evolution gives it the developmental boost it needs to hold its own in combat, but it's still just a Kangaskhan.
That, and pre-evolutions are pointless dex-fillers that add nothing worthwhile to the game.
A better question is why there's no Alola Form of male-only Kangaskhans. Hawaii has an actual, famous feral wallaby infestation on Oahu. Would've been completely appropriate for the setting.
