5 turns. Grounded: +Grass power, +1/16 max HP.
No current Reg M-B usage users are indexed for Grassy Terrain.
Mega Victreebel
Mega Meganium
Mega Chesnaught
Mega Floette
Mega ScovillainFor five turns, heals all Pokémon on the ground for 1/16 their max HP each turn and strengthens their Grass moves to 1.5× their power. Changes Nature Power to Energy Ball.
The user turns the ground into Grassy Terrain for five turns. This restores the HP of Pokémon on the ground a little every turn and powers up Grass-type moves.