Comet Punch inflicts damage, hitting the target 2-5 times per use. There is a 37.5% chance that it will hit 2 times, a 37.5% chance that it will hit 3 times, a 12.5% chance that it will hit 4 times, and a 12.5% chance that it will hit 5 times. Provided that the move does not miss, it will hit 3 times on average, giving it an average power of 54. Although only the first strike can be a critical hit, each successive one will deal the same amount of damage. Comet Punch will end instantly upon breaking a substitute. Bide and Counter deal damage based on the last strike alone.
Each strike has an independent chance of being a critical hit, as well as activating a King's Rock. If Comet Punch activates a target's Focus Band, no subsequent hits can knock it out.
If the user is holding a King's Rock, the final strike has a chance to cause the opponent to flinch.
Generations III and IV
Comet Punch may now continue attacking after breaking a substitute. Each strike has an independent chance of activating a Razor Fang or a contact Ability. If Effect Spore causes the attacker to fall asleep, the move will end immediately. If Comet Punch activates the target's Focus Sash or Sturdy, no subsequent hits can knock it out.
There is now a ~33.3% chance that it will hit 2 times, a ~33.3% chance it will hit 3 times, a ~16.7% chance it will hit 4 times, and a ~16.7% chance it will hit 5 times. Provided that the move does not miss, it will hit ~3.167 times on average, giving it an average power of 57.
If a Focus Sash, Focus Band, or Sturdy activates before the last strike is dealt, the following strike will cause the defending Pokémon to faint. A Focus Band can still activate repeatedly to prevent fainting, but each chance is independent of the previous one. Each individual strike will activate Weak Armor or a Rocky Helmet. Spiky Shield and King's Shield only activate once. Parental Bond does not activate when using Comet Punch.