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There is no freaking reason you should be having trouble with Bisharp, of all things. These are just the best counters, not even anywhere near ALL of them that exist. Just hit it with a fighting, ground, or fire move.
Best Bisharp counters:
1. Conkeldurr with Mach Punch
2. Inferape with Mach Punch.
3. Anything with Justified that can tank a Sucker Punch or Knock Off. See Terrakion and Cobalion, maybe Lucario if Bisharp hasn't boosted.
4. Fire Megas. Mega Stone means they can't get Knocked Off, kill Bisharp with a STAB fire move. See Charizard, Blaziken, Camerupt (lol).
5. Ground megas. See Camerupt (again, lol), Swampert, Garchomp.
6. Burn that fucker and taunt it so it can't SD and get a boost. Physically Defensive Heatran works good for this, but there are other options too. Might not work on Bisharps with Substitute.
7. Physically Defensive Volcarona. Counters every Bisharp set, but sorta sucks in OU because of Talonflame, Heatran, and Chansey, which are pretty common and either kill or wall it to hell.