Serene Grace

Not in Pokémon ChampionsGen III

Game

Scarlet & Violet

This Pokémon's moves have their secondary effect chance doubled.

How it works in Gen IX

This Pokémon's moves have their chance doubled. This effect stacks with the Rainbow effect, except for secondary effects that cause the target to .

“Raises the likelihood of additional effects occurring when the Pokémon uses its moves.”
In-game text, Scarlet & Violet

How Serene Grace changed from game to game, newest first.

Gen V
This Pokémon's moves have their secondary effect chance doubled. added: This effect stacks with the Rainbow effect, except for secondary effects that cause the target to flinch.

Descriptions: Pokémon Showdown’s for each generation, and PokéAPI’s notes on the changes they don’t show. Champions: Pokémon Showdown.

Doubles the chance of its moves' secondary effects.Moves with a secondary effect