Rillaboom-Gmax is a unique Gigantamax form of Rillaboom, a Grass-type Pokémon introduced in Generation VIII (Pokémon Sword and Shield). Rillaboom is the final evolution of Grookey, one of the starter Pokémon in the Galar region, and it evolves from Thwackey at level 35. Rillaboom-Gmax has a striking appearance, featuring the Pokémon playing an enormous set of drums made from tree trunks and vines.
Type: - Grass
Abilities: - Overgrow: This is Rillaboom's standard ability, which boosts the power of Grass-type moves by 50% when the Pokémon's HP is below one-third of its maximum. - Hidden Ability (Grassy Surge): Rillaboom's hidden ability, which creates the Grassy Terrain effect when it enters the battle. This terrain boosts the power of Grass-type moves, restores a bit of HP to grounded Pokémon