You misread. I was asking WHO SCIZOR COUNTERS, not Who counters scizor.
Tried my best with a modified Google search:
Most Steel types do well against Absol. If he lacks Fire Blast, then Forretress, Scizor, Skarmory, and Steelix can all beat him with little difficulty.
Scizor resists both STAB moves and can destroy Abomasnow with Bug or Steel attacks. He also packs U-turn to ruin the SubSeeding strategy.
Scizor can not only Pursuit from 130 base Attack, but also use the horrifying U-Turn to OHKO Celebi, or at least break his Substitute and/or shrug off Leech Seed.
Tyranitar, Heracross, Weavile, Scizor and Houndoom do lots of damage with their STAB Dark and Bug moves, often much more than Cresselia is able to respond to, unless it carries a specific move to counter them (Grass Knot for Tyranitar, Psychic for Gengar and Heracross).
(Pretty sure Scizor beats Regice w/o HP Fire.)
Bellosom: Scizor resists Grass, gets STAB on Bug attacks, and does not completely mind getting Stun Spored if it's going to be Baton Passing.
Jirachi, Metagross, Skarmory, Lucario, Scizor, and Bronzong are all able to switch into Venusaur's Grass and Poison attacks with no problem at all and begin their respective set-ups.
Skarmory, Bronzong, Scizor and Forretress are the best Steels to send in against a Miltank that packs Earthquake, whereas Magnezone, Empoleon, Heatran, Metagross, Jirachi and most other Steels will do fine if Miltank doesn't have that.
Either Salamence or a Steel like Skarmory, Forretress or Scizor, will always wall Exeggutor, because he can only use one Hidden Power and it won't get rid of both.
Deoxys-D: Scizor can set up a BP and / or attack with a Bug move.
Scizor has all manner of weapons to kill Weavile, take your pick from X-Scissor, Brick Break or Iron Head. Life Orb Quick Attack can 2HKO and OHKO after a Swords Dance.