Deals damage and has a 50% chance to poison the target.

Barb Barrage deals damage and has a 50% chance to poison the target.
Pokémon are immune to poison if:

• they are a Poison-type Pokémon
• they are a Steel-type Pokémon
• they have the ability Immunity
• they are behind a Substitute

• In
  LA
  Barb Barrage has 15 PP and a 30% chance to poison the target (60% if the target is already affected by a major status condition
• In
  LA
  a Hisuian Qwilfish can evolve into Overqwil if it uses Barb Barrage 20 times in the strong style.
• From Gen 9 onwards Hisuian Qwilfish must simply know this move while leveling up to evolve into Overqwil.