I think we we want to go with a true, enforceable definition of a "Counter," this should be the one we use.
Counter:
A Counter for the purposes of the CAP Project fulfills three of six requirements:
- Can switch into this CAP's Strongest reliable STAB attacks at least three times from full health.
- Can switch into this CAP's strongest possible coverage move at least twice from full health.
- Can stall this CAP indefinitely using its recovery options either forcing the CAP out or healing enough that the stalling Pokemon can alternate between recovery and attacking.
- Can OHKO or 2HKO the CAP with one of the moves on that Pokemon's relevant official Smogon moveset.
- Can cripple this CAP with a permanent status move without risking a OHKO.
- Can set up, use hazards, weather, or otherwise execute an opponent's strategy without risking a 2HKO.
Notes: A Reliable STAB attack is one with a stable Base Attack Power that deals consistent damage, meaning the strongest non-signature attack under these categories are for each type:
Bug: Megahorn, Bug Buzz
Dark: Crunch, Dark Pulse
Dragon: Outrage, Dragon Pulse
Electric: Wild Charge, Thunder
Fighting: Hi Jump Kick, Focus Blast
Fire: Flare Blitz, Fire Blast
Flying: Brave Bird, Hurricane
Ghost: Shadow Claw, Shadow Ball
Grass: Wood Hammer/Power Whip, Petal Dance
Ground: Earthquake, Earth Power
Ice: Icicle Crash, Blizzard
Normal: Double-Edge, Hyper Voice
Poison: Gunk Shot, Sludge Wave
Psychic: Zen Headbutt, Psychic
Rock: Head Smash, Power Gem
Steel: Meteor Mash/Iron Tail, Flash Cannon
Water: Aqua Tail, Hydro Pump
A Pokemon can become a Counter if we believe coverage for a certain type is helpful, but the move we choose does not have enough BAP to satisfy the second requirement below.
Examples of in-game counters with these criteria:
Skarmory vs. LO Excadrill:
- Can switch into this CAP's Strongest reliable STAB attacks at least three times from full health.
[*]Can switch into this CAP's strongest possible coverage move at least twice from full health.
- Can stall this CAP indefinitely using its recovery options either forcing the CAP out or healing enough that the stalling Pokemon can alternate between recovery and attacking.
- Can OHKO or 2HKO the CAP with one of the moves on that Pokemon's relevant official Smogon moveset.
- Can cripple this CAP with a permanent status move without risking a OHKO.
[*]Can set up, use hazards, weather, or otherwise execute an opponent's strategy without risking a 2HKO.
BW Standard Tyranitar vs. LO Latios:
- Can switch into this CAP's Strongest reliable STAB attacks at least three times from full health.
- Can switch into this CAP's strongest possible coverage move at least twice from full health.
[*]Can OHKO or 2HKO the CAP with one of the moves on that Pokemon's relevant official Smogon moveset.
- Can stall this CAP indefinitely using its recovery options either forcing the CAP out or healing enough that the stalling Pokemon can alternate between recovery and attacking.
- Can cripple this CAP with a permanent status move without risking a OHKO.
- Can set up, use hazards, weather, or otherwise execute an opponent's strategy without risking a 2HKO.
(
Minor note: Though Standard BW Tyranitar carries Stealth Rock, if it switches into LO Latios Surf and uses Stealth Rock it will be unable to counter it in the future, so the last requirement isn't highlighted. Tyranitar in this case counters primarily because it can threaten a OHKO back, not because it can set up or use hazards. Dragon Pulse + Surf + Surf also has a chance to 3HKO, and if SR is down it always 3HKOs. If Standard Tyranitar subbed out Stealth Rock for Thunder Wave, it would qualify under criteria 5 as well.)
CM Reuniclus vs. Chansey:
- Can switch into this CAP's Strongest reliable STAB attacks at least three times from full health.
- Can switch into this CAP's strongest possible coverage move at least twice from full health.
- Can stall this CAP indefinitely using its recovery options either forcing the CAP out or healing enough that the stalling Pokemon can alternate between recovery and attacking.
- Can OHKO or 2HKO the CAP with one of the moves on that Pokemon's relevant official Smogon moveset.
- Can cripple this CAP with a permanent status move without risking a OHKO.
- Can set up, use hazards, weather, or otherwise execute an opponent's strategy without risking a 2HKO.
SD Gliscor vs. Skarmory:
- Can switch into this CAP's Strongest reliable STAB attacks at least three times from full health.
- Can switch into this CAP's strongest possible coverage move at least twice from full health.
- Can stall this CAP indefinitely using its recovery options either forcing the CAP out or healing enough that the stalling Pokemon can alternate between recovery and attacking.
- Can OHKO or 2HKO the CAP with one of the moves on that Pokemon's relevant official Smogon moveset.
- Can cripple this CAP with a permanent status move without risking a OHKO.
- Can set up, use hazards, weather, or otherwise execute an opponent's strategy without risking a 2HKO.
Ultility Jellicent vs. Bulky Swords Dance Scizor:
- Can switch into this CAP's Strongest reliable STAB attacks at least three times from full health.
- Can switch into this CAP's strongest possible coverage move at least twice from full health.
- Can stall this CAP indefinitely using its recovery options either forcing the CAP out or healing enough that the stalling Pokemon can alternate between recovery and attacking.
- Can OHKO or 2HKO the CAP with one of the moves on that Pokemon's relevant official Smogon moveset.
- Can cripple this CAP with a permanent status move without risking a OHKO.
- Can set up, use hazards, weather, or otherwise execute an opponent's strategy without risking a 2HKO.
(
Minor notes: Bulky SD Scizor only has its STABs so there's really no coverage moves to speak of. You could technically count it, bit it's not really applicable. The combination of burn and taunt is what qualifies it for criteria 5 and 6, since UC Jellicent effectively shuts down what makes Bulky SD Scizor dangerous: Attack boosting + Roost)
This is a decent starting point I think. Criticisms are welcome.