You gave me about 3 different sets, I don't know what your smoking but I think you were confused cause there is no species clause to have those 3 types.Honchkrow -- Fails to SubSeed version.
Aerodactyl -- You don't keep it in... Just like you don't keep Salamence in Weavile. And it's OU.
Crobat -- We knew that. Established in first page. Can die to Life Orb Seed Flare with SR on field.
Scarfdoom -- Killed by ScarfSkyMin's Earthpower.
Moltres -- Die to Air Slash after a Flinch if switch into Stealth Rock. Ripped apart by SubSeed version.
Entei -- SubSeed Version can Flinch it to death since it's not fast enough. SR deals even more damage.
Sub seed can be a problem though and serence grace+ his attacks are kind of cheap. ScarfHeat rotom beats it also with the use of trick to fuck its sub-seed combo up. Scarf isn't really a threat to me, it's actually quite easy to counter, as for specs, seed flare just goes to a fire pokemon and air slash to a steel,*STAB moves. I actually see Life Orb/YacheMin as the top threats but then Shaymin is vulnerable to aerodactyl and other scarfed fire pokemon. Skymin can be un-predictable, making it a problem in OU with all the different sets. I just know for sure that specs-min is the least popular. I guess skymin can be countered if you know what type it is.
Also they were just some examples of BL pokemon that CAN beat skymin for your benefit. Being under OU doesnt make them crap and/or inefficient. Look at Scizor(one of the most common OUS) vs. Shedninja(UU) I mean seriously OUs are not the only pokemon in the game. Pfft, larpas beats Skymin with ice shard.