Tapu Bulu was the fifth Pokémon to be added to the Legendary Arena. It is weak to Flying-type moves while on its first and third HP bars, and weak to Poison-type moves while on its second. It activates the field effect of Grassy Terrain at the beginning of each HP bar and each time it uses its Sync Move; Grassy Terrain increases the power of Grass-type moves and restores HP when using a Grass-type move. Grassy Terrain can be countered by inflicting Poison or by using "interference" status conditions, such as flinching, confusion, or trapped, although Tapu Bulu will increase its resistance to the latter each time it recovers, until it becomes immune.
To challenge the Legendary Arena, players must have completed Main Story Chapter 2: Defeat Team Break! (Normal) in single-player.