Bold indicates a Pokémon gains STAB from this move. Italics indicates a Pokémon whose evolution or alternate form receives STAB from this move. A dash (−) indicates a Pokémon cannot learn the move by the designated method. An empty cell indicates a Pokémon that is unavailable in that game/generation.
One or both of Corphish's pincer glows white and it hits its opponent with one of them, or Corphish's pincers glow white and it hits the ground, sending an invisible shockwave at the opponent.
Crabhammer and Octazooka are the only moves whose Japanese names include the name of a Pokémon. In this case, クラブ Crab is Krabby's Japanese name.
Crabhammer and Aqua Tail have the same type, base power, accuracy, and PP, and both are physical moves that make contact. The only difference between them is Crabhammer's increased critical hit ratio.