Jagged-Edge is an ability that makes contact-based attacks from the opposing Pokémon incur additional damage. Specifically, when an opponent uses a move that makes direct contact with the Pokémon having the Jagged-Edge ability, they receive damage as a form of recoil, much like the effect of the move Rocky Helmet. This additional damage is typically calculated as a percentage of the attacker's maximum HP, effectively punishing physical attackers who rely on close-contact moves.