From Bulbapedia, the community-driven Pokémon encyclopedia.
(Japanese: くさのちかい Grass Oath) is a damage-dealing Template:Type2 move introduced in Generation V.
Grass Oath inflicts regular damage in single battles, with additional effect when combined by Fire Oath or Water Oath in double or triple battles.
If it is followed on the same turn by Water Oath, it will decrease the speed of all foes by half for four turns.
If it follows Fire Oath on the same turn, it will cause all foes to take damage equal to 1/8 of their maximum HP at the end of every turn for four turns.
In Pokémon Black and White, a man in Hodomoe City will teach Grass Oath to any Template:Type2 starter Pokémon.
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