Chlorophyll (ability)

Effect

Chlorophyll doubles the ability-bearer's Speed during bright sunshine.

Game descriptions

Ruby​/​Sapphire
FireRed​/​LeafGreen
Emerald
Raises SPEED in sunshine.
Diamond​/​Pearl
Platinum
HeartGold​/​SoulSilver
Boosts the Pokémon’s Speed in sunshine.
Black​/​White
Black 2​/​White 2
Boosts the Pokémon’s Speed in sunshine.
X​/​Y
O.Ruby​/​A.Sapphire
Boosts the Pokémon’s Speed stat in sunshine.
Sun​/​Moon Boosts the Pokémon’s Speed stat in sunshine.
Ultra Sun​/​Ultra Moon Boosts the Pokémon’s Speed stat in harsh sunlight.