Ok I found something on EV Reducing Berries:
"The first berry used brings the evs in that particular stat down to 100 if they are greater than 100 total. So for example if your lucario had 252 evs in attack and you used one Kelpsy berry on it, it would then have 100 evs in attack. Each sequential berry you use after the first erases 10 more evs. So for example, once you used that first kelpsy on lucario and got it down to 100 evs in atk, when you use a second kelpsy it will now have 90, and when you use another kelpsy it will then have 80 and so on and so forth until you get to 0. So in conclusion the greatest number of ev reducing berries you will ever have to use on a poke to completely clear its evs in a particular stat is 11. If a pokemon has 100 evs or less in a certain stat and you use an ev reducing berry for that stat it erases 10 evs. So, for example, if your lucario had 49 evs in HP and you used one Pomeg berry on it, it would then have 39 evs in HP"