Level 100 Statistics (see level 5, 50, 100)
Glaceon has a very high Special Attack, which makes it a powerful wallbreaker that can even 2HKO dedicated special walls such as Audino and Lickilicky. Its Ice typing also gives it good coverage in NU, hitting a good portion of the tier for high amounts of damage. Glaceon also has usable bulk, so it is capable of taking hits decently. Glaceon also has enough Speed to outpace some of the slower Pokemon in the tier. However, Glaceon's typing, while great offensively, is poor defensively, giving it numerous exploitable weaknesses and few resistances. Its movepool is also very small, giving it very limited coverage. Finally, Glaceon faces heavy competition from Jynx, which has better Speed and a wider movepool.
Choice Specs allows Glaceon to serve as a powerful wallbreaker, being able to deal heavy damage to many Pokemon in the tier. Ice Beam serves as strong and reliable STAB, able to 2HKO Audino and Lickilicky after Stealth Rock damage. Hidden Power Ground hits Steel-types such as Probopass as well as some Fire-types such as Rapidash. Signal Beam hits Jynx and Musharna hard and serves as a filler in general. The last moveslot makes full use of Glaceon's relatively poor movepool. Baton Pass allows Glaceon to switch out of its counters and resort to a teammate, while Frost Breath allows it to bypass Calm Mind Musharna.
Team Options & Additional Comments >>>
Glaceon has a relatively small movepool, and there isn't much it can use aside from what is listed above. Barrier is an option that allows Glaceon to increase its bulk and Baton Pass more effectively. Unfortunately, Barrier is a very situational move at best. Wish can be used to give Glaceon some form of recovery, but despite Glaceon's bulk, its defensive typing is not very good. In addition, due to Glaceon's low HP, its Wishes are not very large. A Choice Scarf is an option to allow Glaceon to patch up its low Speed and be a decent revenge killer. However, this is heavily outclassed by Jynx, which has better Speed, Trick, and Lovely Kiss.
Checks and Counters
Glaceon does not have many counters due to its raw power, but it has plenty of checks thanks to its low Speed and poor defensive typing. That said, Munchlax and Regice are the best counters to Glaceon available, as their great special bulk and Ice resistance means they take little from Ice Beam and can cripple it with paralysis. Fighting-types such as Sawk and Gurdurr are able to make quick work out of Glaceon. Fire-types such as Charizard and Rapidash can also check Glaceon well, but cannot switch in safely. Carracosta can switch into a resisted Ice Beam and OHKO with Stone Edge.