Rillaboom is a gorilla-like Pokémon with a stocky, muscular build dominated by various shades of brown. Its tan-colored forehead, chest, and limbs contrast with its darker brown nose and ears, while orange accents around its mouth and eyes give it a distinctive face. The most striking feature is the thick, flowing green hair that cascades down from its head like leaves, complete with a single vine-like strand between its eyes that curls at the end—fans often point out it resembles a musical note, which fits perfectly with what Rillaboom is all about.
Its body is decorated with tan diamond-shaped markings that run down its spine, and it sports green leaf-like adornments on its hips and shoulders that look almost like armor. On its wrists are cuff-like accessories resembling leafy crowns.
What really defines Rillaboom, though, is its signature tree-stump drum. It carries this massive instrument on its back at all times, pulling it out for battle. The drum is built from an actual tree stump with thick branch stumps protruding outward, which serve as both legs and additional toms. Rillaboom stores two drumsticks in its wrist cuffs, ready to go at a moment's notice.
The drumming itself is core to Rillaboom's identity and social structure. When it drums, it can tap into the power of the tree stump—the roots respond to the rhythm during battle. Within a troop, leadership isn't decided by strength; it goes to whoever has the best technique. Disputes between Rillaboom usually settle through drum battles, which is a pretty cool way to establish hierarchy.
Rillaboom has a naturally calm and kind temperament. It values group harmony above almost everything else and gets genuinely upset by anything that threatens it. Those who cause discord get strict discipline until they learn their lesson. At the same time, Rillaboom will fiercely protect its allies from danger.
Gigantamax Form
When Gigantamax, Rillaboom's upper body essentially merges with its drum kit, which expands and reshapes into a full setup. Its leaf adornments transform into four additional arms, each wielding a drumstick independently, while its vine-like hair stands straight up and curls dramatically at the tip. The power building up inside compels it to perform genuinely transcendental drumming, controlling each stick with supernatural precision. The sound carries across oceans and entire regions, and according to lore, anyone who hears the beat is compelled to dance uncontrollably.
Evolution
Rillaboom evolves from Thwackey and is the final form in its evolutionary line.
Content compiled by AnimeList.moe from publicly available sources.
