I'll put the hyperlinks in a bit, don't upload till I have them in there. :)
EDIT: Done with that.
Direct Countering:
Commonly Seen Choiced Attackers:
Kyogre, Scizor, Palkia, Dialga
Commonly Seen Boosting Attackers:
Rayquaza, Kyogre, Mewtwo, Darkrai
Commonly Seen Mixed Attackers:
Palkia, Rayquaza, Dialga
Indirect Countering:
Commonly Seen Ability Trappers:
Wobbuffet
Wobbuffet deserves a special mention for his ability to turn walls into setup bait for sweepers such as Rayquaza with Encore, along with the Tickle strategy, in which a wall is Encored, Tickled repeatedly, and then hit with Pursuit by a Pseudo-trapper.
Commonly Seen Pseudo-Trappers:
Tyranitar, Scizor, Metagross
Commonly Seen Taunters:
Deoxys-S, Mewtwo, Mew, Darkrai
Commonly Seen Trickers:
Mewtwo
Commonly Seen Exploders:
Mew, Mewtwo, Metagross
EDIT: Done with that.
Direct Countering:
Commonly Seen Choiced Attackers:
Kyogre, Scizor, Palkia, Dialga
Commonly Seen Boosting Attackers:
Rayquaza, Kyogre, Mewtwo, Darkrai
Commonly Seen Mixed Attackers:
Palkia, Rayquaza, Dialga
Indirect Countering:
Commonly Seen Ability Trappers:
Wobbuffet
Wobbuffet deserves a special mention for his ability to turn walls into setup bait for sweepers such as Rayquaza with Encore, along with the Tickle strategy, in which a wall is Encored, Tickled repeatedly, and then hit with Pursuit by a Pseudo-trapper.
Commonly Seen Pseudo-Trappers:
Tyranitar, Scizor, Metagross
Commonly Seen Taunters:
Deoxys-S, Mewtwo, Mew, Darkrai
Commonly Seen Trickers:
Mewtwo
Commonly Seen Exploders:
Mew, Mewtwo, Metagross