I need to reset my Pokemons base stats but getting a reset bag takes too long and I do not know what else to do.
The Perilous Soup removes all the effort values.
Go to the Juice Shoppe in Lumiose and mix a Kee and Maranga Berry to get one.
Source: www.serebii.net/xy/juiceshoppe.shtml
Unfortunately, outside of using EV reducing Berries, which take long, a Reset Bag is your only option. The EV Berries reduce 10 EVs at a time, so you will need a large quantity of them to actually revert the stats.
More on EV reducing Berries & other EV related things
Revised here:-
Each berry (reduces a stat by 10 points with each use)
HP = Pomeg Berry Attack = Kelpsy Berry Defense = Qualot Berry Special Attack = Hondew Berry Special Defense = Grepa Berry Speed = Tamato Berry
As for the Reset bags - here's a tip
Scroll over to super training and then delete all the bags. Leave the ds somewhere (on still) and still on the same page of super training for about 30 minutes. Once you've come back later you'll have a full slot of 12 bags and possibly a few reset bags.
Apologies for my grammer in sentencing.
Sadly there is no easier way, BUT I do have a tip for getting reset bags! When a Pokémon is happy in Super training, just punch the grey nothing bag and it gets you bags, and a MUCH better chance at getting a reset bag!