Pokesav is considered Hacking
Not sure if 'Cheating' is the word but I guess it still works
Everyone uses Smogon sets... it gets a little overused?
Here's a set I made for my Glaceon:
Nature: Timid
EV's: 216 Special Attack, 252 Speed and 42 HP
Item: Icy Rock/Salac Berry
Moves:
Hail/Shadow Ball
Blizzard
Mirror Coat
Hidden Power (Ground Type)
This is mainly based on a Hail Team which I used when against the Battle Tower, it helped me alot, though i'm not sure how it'll perform into competitive battling. If you have an Abomasnow on your team or something else that has Hail on your team, then have Glaceon to know Shadow Ball, however if you don't have anything for Hail support in your team, let Glaceon learn Hail.
This team worked well because it learnt to repel its weaknesses in the Battle Tower (again, don't know how good it will be in competitive battling). Glaceon has four weaknesses: Fire, Fighting, Steel and Rock. Hidden Power (Ground) can counter three of those types but leaving fighting behind. But thereotically, you should be able to outspeed most fighting types and hopefully 1HKO them.
If you are planning to have Hail Support in your team, get Glaceon to hold Salac Berry so it can outspeed its opponent during some situation. If the Hail Support isn't an Abomasnow, get that pokemon to hold the Icy Rock. If you have no Hail support in your team, then get Glaceon to hold Icy Rock to prolong the hail.