An electric punch. It may paralyze.
Thunder Punch is an Electric-type physical move with a base power of 75 and an accuracy of 100%. It has a 10% chance to paralyze the target. In Polished Crystal, Thunder Punch can be learned by various Electric-type Pokémon, providing them with a solid offensive option to deal damage while also having the potential to inflict paralysis on opponents in battle.
This is a Move Tutor move. TThe location page may have more information on how to obtain it.