Rillaboom is a Grass-type Pokémon introduced in Generation VIII. It evolves from Thwackey starting at level 35. It is the final form of Grookey. Rillaboom has a Gigantamax form that will appear in The Isle of Armor. Take a look below for 30 awesome and fun facts about Rillaboom.

1. Rillaboom is a bipedal, ape like Pokemon.

2. Its body is mostly mud-brown in coloration, including its face and body, as well as its thick arms and legs.

3. Its face has an orange mouth, with a dark brown nose.

4. This dark brown coloration is also seen on its triangular ears, as well as under its eyes, which themselves have orange irises and white pupils.

5. Its forehead is a light tan color, as well as its chest, abs, hands, and feet.

6. It also has a bow-shaped mark of the same color on each shoulder. 

7. Rillaboom also has leaves protruding from its head, creating a thick bush of hair on its head, with a single vine that falls from its forehead like a strand of hair.

8. It also has a belt and cuffs made of leaves.

9. Rillaboom always carries its signature drum with it on its back, and pulls it out when engaged in battle.

10. This bass drum is crafted from a tree stump, with several thick branch stumps protruding from it, which form both the legs of the bass drum as well as mid and high toms.

11. Rillaboom also carries two drumsticks in its cuffs and takes them out to beat its drum.

12. By drumming, Rillaboom can tap into the power of its special tree stump.

13. The roots of the stump follow the direction of drumming in battle.

14. A Rillaboom with the best drumming technique can become the leader of its troop.

15. Due to its kind disposition, it values harmony within the group.

16. Rillaboom is very sensitive towards discord that could threaten the group’s harmony, so it keeps a strict watch for such actions.

17. Due to its strong sense of unity, it will ferociously defend its allies from trouble.

18. As Gigantamax Rillaboom, its upper body has been fused with its enlarged tree-stump drum.

19. The stump has changed to resemble a full drum kit. 

20. The leaves expands to become four arms, each holding a drum stick while its single vine stands up and curls at the tip. Three red clouds float above it.

21. Rillaboom, as a result of Gigantamaxing, has become more powerful due to fusing with the drum.

22. It can control the sticks of the drum to perform transcendental drumming techniques.

23. It is compelled to drum due to its power building up from inside.

24. The sounds it makes can reach across oceans and other regions. 

25. Those who hear the beat will start to dance uncontrollably.

26. Rillaboom is the only known Pokémon capable of using the move Drum Beating and exclusive G-Max Move G-Max Drum Solo.

27. Rillaboom has the highest base Attack stat of all fully evolved starter Pokémon.

28. Rillaboom may be based on a gorilla with elements from drummers, most notably Taiko drummers. Its behavior may reference the fact that gorillas make drumming sounds by beating their chests to show social dominance. It may also take inspiration from the belief that music stimulates plant growth.

29. Rillaboom’s Gigantamax form seems to draw inspiration from modern rock drummers.

30. Rillaboom may be a combination of gorilla and boom.