From Bulbapedia, the community-driven Pokémon encyclopedia.

Hustle (Japanese: はりきり Push Limits) is an ability introduced in Generation III that trades accuracy for power, therefore boosting Attack by 50% but lowering accuracy to 80%. Six Pokémon have this ability. Outside of battle, if the Pokémon with Hustle is leading, then Hustle increases the chance of battling a higher-leveled wild Pokémon by 50% (see also Pressure and Vital Spirit).

Pokémon with Hustle

Single ability

As of Generation IV, no Pokémon has Hustle as their only ability.

Dual ability

Togepi	Togetic	Togekiss
Serene Grace	Serene Grace	Serene Grace
Corsola	Remoraid	Delibird
Natural Cure	Sniper	Vital Spirit