Ability · Gen 9 · 1 Pokémon
Costar
On switch-in, this Pokemon copies all of its ally's stat stage changes.
Costar was introduced in Generation 9. 1 Pokémon and forms can have it (1 as a hidden ability).
Best Pokémon with Costar
Ranked by usage in public Pokémon Showdown battles (Champions VGC first, then National Dex OU, SV OU and Champions Singles), with how many of each Pokémon's sets actually run Costar.
Pokémon with Costar
As a hidden ability (1)
Costar FAQ
What does Costar do?
On switch-in, this Pokemon copies all of its ally's stat stage changes.
Which Pokémon have Costar?
1 Pokémon and forms can have Costar, 1 of them only as a hidden ability: Flamigo.
Is Costar a hidden ability?
Yes, every Pokémon listed here gets Costar as its hidden ability.
What are the best Pokémon with Costar?
By competitive usage, the most used Pokémon that can have Costar are Flamigo (#337 in National Dex OU).
Effect text from Pokémon Showdown (MIT); which Pokémon have it from Showdown's Pokédex, cross-checked against PokéAPI. Unofficial fan site.