Starting in Generation V, every attacking move that does not already have a chance to flinch is affected by King's Rock.
In Generations II-IV, only certain moves are affected by King's Rock. These are:
Absorb
Aerial Ace
Aeroblast
Air Cutter
Air Slash
Aqua Jet
Aqua Tail
Arm Thrust
Assurance
Attack Order
Aura Sphere
Avalanche
Barrage
Beat Up
Bide
Bind
Blast Burn
Bone Rush
Bonemerang
Bounce
Brave Bird
Brick Break
Brine
Bug Bite
Bullet Punch
Bullet Seed
Charge Beam
Clamp
Close Combat
Comet Punch
Counter
Crabhammer
Cross Chop
Cross Poison
Crush Grip
Cut
Dark Pulse
Dig
Discharge
Dive
Double Hit
Double Kick
Double Slap
Double-Edge
Draco Meteor
Dragon Breath
Dragon Claw
Dragon Pulse
Dragon Rage
Dragon Rush
Drain Punch
Drill Peck
Earth Power
Earthquake
Egg Bomb
Endeavor
Eruption
Explosion
Extreme Speed
False Swipe
Feint Attack
Fire Fang
Fire Spin
Flail
Flash Cannon
Fly
Force Palm
Frenzy Plant
Frustration
Fury Attack
Fury Cutter
Fury Swipes
Giga Drain
Giga Impact
Grass Knot
Gunk Shot
Gust
Gyro Ball
Hammer Arm
Head Smash
Hidden Power
High Jump Kick
Horn Attack
Hydro Cannon
Hydro Pump
Hyper Beam
Ice Ball
Ice Fang
Ice Shard
Icicle Spear
Iron Head
Judgment
Jump Kick
Karate Chop
Last Resort
Lava Plume
Leaf Blade
Leaf Storm
Leech Life
Low Kick
Mach Punch
Magical Leaf
Magma Storm
Magnet Bomb
Magnitude
Mega Drain
Mega Kick
Mega Punch
Megahorn
Meteor Mash
Mirror Coat
Mirror Shot
Mud Bomb
Mud Shot
Muddy Water
Night Shade
Night Slash
Ominous Wind
Outrage
Overheat
Pay Day
Payback
Peck
Petal Dance
Pin Missile
Pluck
Poison Jab
Poison Tail
Pound
Power Gem
Power Whip
Present
Psycho Boost
Psycho Cut
Psywave
Punishment
Pursuit
Quick Attack
Rage
Rapid Spin
Razor Leaf
Razor Wind
Return
Revenge
Reversal
Roar of Time
Rock Blast
Rock Climb
Rock Throw
Rock Wrecker
Rolling Kick
Rollout
Sand Tomb
Scratch
Seed Bomb
Seed Flare
Seismic Toss
Self-Destruct
Shadow Blast
Shadow Blitz
Shadow Bolt
Shadow Break
Shadow Chill
Shadow Claw
Shadow End
Shadow Fire
Shadow Force
Shadow Punch
Shadow Rush
Shadow Sneak
Shock Wave
Signal Beam
Silver Wind
Skull Bash
Sky Attack
Sky Uppercut
Slam
Slash
Snore
Solar Beam
Sonic Boom
Spacial Rend
Spike Cannon
Spit Up
Steel Wing
Stone Edge
Strength
Struggle
Submission
Sucker Punch
Super Fang
Surf
Swift
Tackle
Take Down
Thief
Thrash
Thunder Fang
Triple Kick
Trump Card
Twineedle
Twister
U-turn
Uproar
Vacuum Wave
Vice Grip
Vine Whip
Vital Throw
Volt Tackle
Wake-Up Slap
Water Gun
Water Pulse
Waterfall
Weather Ball
Whirlpool
Wing Attack
Wood Hammer
Wrap
Wring Out
X-Scissor
Not all of these moves are affected in every generation. For specifics, please reference Bulbapedia.
