Mmm.. for the speed EVs, wouldn't 200 Speed EVs with Jolly be enough for Crobat? It's just enough to out-speed base 123 (Noivern) with a full 252 Speed EV investment with a positive nature. You'd lose on the 130 Speed tie and the base 126~129, only notable Pokemon you'd lose on is Weavile (who has Priority anyway, and I doubt there will be much usage for Weavile), Jolteon (speed tie, wouldn't want to stay in on this), Mega-Gengar (speed tie)..
A spread of 252 Att, 200 Speed and 56 HP Jolly is what I'd probably recommend