What is Generation VIII Pokemon Grookey at the end of its evolution?

At the end of its evolutionary line, Generation VIII Pokémon Grookey becomes Rillaboom. Grookey first evolves into Thwackey and then reaches its final form, Rillaboom, a Grass-type Pokémon modeled on a large primate and drummer.

Grookey, Pokédex number 810, is one of the three starter Pokémon introduced in Pokémon Sword and Shield. It carries a stick from its forest habitat and uses it as a drumstick. After evolving into Thwackey, it gains a second stick and develops a stronger connection to rhythm and percussion.

Rillaboom is Pokédex number 812 and uses a large wooden drum grown from a tree stump. Its drumming can influence the roots and vegetation around it. A common mix-up is to name Thwackey, which is Grookey’s middle evolution, rather than Rillaboom, its final evolution. Grookey’s evolutionary family is the only Generation VIII starter line based entirely on Grass types.