Also can we please not do the "WHAT ONE POKEMON 100% COUNTERS ALL SKYMIN + ALL POSSIBLE PARTNERS" like we did with mega mence.
I was merely explaining why Sand/Hail weren't the greatest, though my message was a bit flawed in explaining it. Also, this is doubles, and unless you can build a team that can hard stop Pokemon+Partner then I don't think you can say it's balanced.
Mega Mence+Jirachi is very hard to beat, in all honesty I don't see any definite one or two mons that A) hard stop it and B) switch in easily to it. The closest things to fulfill the two requirements, without any favorable conditions such as Trick Room set up, are Heatran and Cresselia, as Heatran switches in to a resisted hit and
2HKOs Jirachi while hitting Mega Mence sub with
2 Heat Waves while Cresselia does
almost 75% to Mega Mence.
If Trick Room is up, Mawile, Gardevoir, and Aurorus would beat it, but so what? Mega Rayquaza loses to Trick Room just as easily because of those mons. Maybe we should unban that with Mence.
While Skymin+Keldeo isn't as difficult to face, there are quite a few things that they so easily trouble in the current meta game, and while Skymin+Keldeo is out on the field you know something is dying soon.
Skymin+Kangaskhan makes Trick Room almost absolutely impossible, and Tailwind setters find it so hard to do much. You need the bulky/weaker Tailwind and Trick Room setters to make them usable against those two. Surprisingly, Cresselia and Suicune are actually piss weak!
Skymin+Kyube? Anything that Kyube doesn't necessarily beat Skymin assists in absolutely ruining.
Skymin+Charizard... Charizard obliterates half the meta game and Skymin makes the only wall complete wall Heatran with its Seed Flares and Air Slashes, and it has no difficulty getting them off.
Skymin+Special Attacker is just generally going to be something that a team is not going to like facing at all. Skymin+Pokemon is just generally too difficult for the meta game to "easily check/counter".