No, it wouldn't be wise to max out the speed then, since it would be a lot lower then having it be an increasing stat, and also in some cases theres pokemon that are just really slow, and dont gain in much speed stats even with a Hasty nature, those wont be worth it either.
Here ill make a chart about the berries too
Pomeg Berry = -10 HP EV's
Kelpsy Berry = -10 Attack EV's
Qualot Berry = -10 Defense EV's
Hondew Berry = -10 Sp.Attack EV's
Grepa Berry = -10 Sp.Defense EV's
Tamato Berry = -10 Speed EV's