Breloom is a bipedal, mushroom-like Pokémon with some kangaroo and dinosaur-like qualities. Most of its body is green, but its head to its neck and its tail are beige. On top of its head is a green, mushroom-like cap with beige gills underneath and a round, red berry-like growth with a hole in the middle on either side. It has oval, black eyes, a beak-like mouth, and frilled segments around the base of its neck. There are two red claws on each of its hands and feet. At the end of its tail, there are seed clusters made of hardened toxic spores that are horrible to eat.
Breloom can stretch its short arms to deliver fast punches. Additionally, it has light, springy footwork that allows it to get close to opponents. Another way it closes in on opponents is by incapacitating them with spores released from the holes in its cap. Its technique is equal to that of professional boxers. It prefers to live in tropical forests, where it feeds on decomposing trees and plants. In Generation IX, Mach Punch is its signature move.
Prior to Generation V, Breloom and its pre-evolved form, Shroomish, were the only known Pokémon that could have Poison Heal as an Ability.
Breloom evolves from Shroomish.
(For specifics on this Pokémon's evolution in the games, refer to Game data→Evolution data.)
Breloom made its main series debut in A Shroomish Skirmish, where they attacked Ash and his friends after evolving from Shroomish because of Team Rocket stealing their food. May's newly evolved Combusken took on the leader Breloom in a vicious hand-to-hand fight and suddenly declared a truce between them, saving the day.
In Journey to the Unown!, Kenny used a Breloom in a battle against Ash's Turtwig. In Team Shocker!, it was used during the Solaceon Town Pokémon Contest. Breloom's performance in the Appeals Round advanced Kenny to the Contest Battles.
In A Windswept Encounter!, a wild male Breloom was in love with an Orange Flower Floette and had three Beedrill followers. He fought Noibat over the Floette, who didn't reciprocate his feelings, but later worked together with Noibat to defeat Team Rocket.
Multiple Breloom debuted in a cameo in Jirachi: Wish Maker as some of the residents of Forina, Jirachi's home.
A Breloom appeared in a flashback in Poetry Commotion!.
A Breloom appeared in the opening sequence of Where's Armaldo?.
A Coordinator's Breloom appeared in Deceit and Assist.
In Lucario and the Mystery of Mew, a Trainer's Breloom battled Ash's Pikachu during the Rota tournament.
In Numero Uno Articuno, Noland's Breloom was living at the Battle Factory.
A Breloom appeared in Pasta La Vista!, under the ownership of the Fighting Dojo.
A Breloom appeared in Weekend Warrior.
A Trainer's Breloom appeared in Spontaneous Combusken!.
A Coordinator's Breloom appeared in May, We Harley Drew'd Ya!.
Multiple Breloom appeared in the opening sequence of Giratina and the Sky Warrior.
In Zoroark: Master of Illusions, multiple Breloom were living in Crown City. Two of them worked with the other Pokémon in surrounding Zorua with the intention of attacking him, angry for what Zoroark did to the city. Before a fight broke out, the Breloom, along with the other Pokémon, were calmed down by Celebi.
A Breloom appeared in Mewtwo — Prologue to Awakening.
In Genesect and the Legend Awakened, multiple Breloom were living at Pokémon Hills. They participated in the battle against the Genesect Army.
In Kalos League Passion with a Certain Flare!, a Breloom fought a Scrafty in a video that Sawyer was watching.
A Coordinator's Breloom appeared in Reuniting for the First Time!.
||Breloom, the Mushroom Pokémon. Breloom is the evolved form of Shroomish. Its excellent footwork gets it within striking distance of its opponent, where it unleashes a barrage of punches.
||Breloom, the Mushroom Pokémon. Its short arms stretch when it throws punches, and its technique is as good as a professional boxer.
||Breloom, the Mushroom Pokémon. Breloom releases poisonous spores to weaken its opponents, then attacks with powerful punches.
In The Cavern, a wild Breloom was fleeing from a storm that a Primal Kyogre was creating.
Breloom seems to be based on a mushroom, specificially agaric types. The red nodules on its head resemble the berry-like arils on a yew tree. The shape of its head is reminiscent of a kasa, traditional Japanese hats with wide brims. Some of these hats were worn by monks, samurais, and soldiers, which may explain Breloom's Fighting type. Its body structure resembles a kangaroo, so its Fighting type and boxing behavior could also be inspired by the boxing kangaroo. It may also be based on a dinosaur due to its claws, its dome-shape head resembling that of a pachycephalosaurus, its club-shaped tail resembling that of an ankylosaurus, and its pre-evolution Shroomish resembling a dinosaur egg.
Breloom may be a combination of umbrella and mushroom. It may also incorporate brawl. Incidentally, Breloom is also an anagram of "bloomer".
Kinogassa may be a combination of キノコ kinoko (mushroom) and 笠 kasa (traditional Japanese hat) or 傘 kasa (umbrella). It may be derived from 衣笠茸 kinugasatake (bamboo mushroom).