[EeveeTrainer]

Skymin does not come close to the level of sheer uncounterability seen in such previous metagame threats as Garchomp and Manaphy. Even a simple Skarmory, with its measly 176 Special Defense, can often force Skymin out. Additionally, its PP is very quickly drained by the likes of one of its major switch-ins, Zapdos. The Life Orb set is worn down in no time, especially in Sandstorm/Hail, more especially by Stealth Rock, and even further especially with Substitute.

The most fearsome form of Skymin, in my opinion, is the SubSeeder, but it isn't necessarily any better at this job than Sceptile; its 100 base HP versus Sceptile's 70 actually works against it with Leech Seed recovery being unable to restore enough HP to offset 85-101 HP Substitutes. And, like Sceptile, the SubSeeder tends to be easily walled with only two attacks.

While Skymin can be annoying, that's not enough to force it to Uber. I voted OU because of its relative ease to counter.