*weakness as in something that can rek them/counter
"Any Pokémon with decent offense and the ability to hit Sableye for neutral damage can counter it, but all Pokémon have to beware of losing their item to Knock Off. After you switch one Pokémon into Sableye, that should be your general switch-in for the rest of the match, to limit the effectiveness of Knock Off. Don't get too predictable with this, however, or the Sableye user can abuse your obvious switches to get in a real heavy-hitter like Electabuzz or Hitmonlee."