STAB (same-type attack bonus)
STAB is a 1.5 times damage bonus when a Pokémon uses a move that matches one of its own types
STAB applies to the user's current types, so a Water-type using Surf deals 1.5 times damage. The ability Adaptability raises the bonus to 2 times. STAB multiplies with type effectiveness, so a STAB move against a double weakness deals 6 times the base calculation.
Main-series games; introduced in Generation I, Red and Green.
2 later changes
- Diamond and Pearl added Adaptability, which raises STAB to 2 times.
- Scarlet and Violet set STAB to 2 times when a Pokémon Terastallizes into one of its original types, and kept 1.5 times on original types after Terastallizing into a new one.