Chan Bruce

The Invincible Pokémon Brothers (Japanese: ポケモン最強ブラザーズ Strongest Pokémon Brothers), also called the Three Fighting Brothers (Japanese: カンフー三兄弟 Three Kung fu Brothers) are a trio of brothers from Viridian City that own Fighting-type Pokémon. Their names are Kim (Japanese: ブルース・チャン Chan Bruce), Kai (Khan in Chronicles, Japanese: ブルース・シャン Shan Bruce), and Kail (Kam in Chronicles, Japanese: ブルース・リン Rin Bruce). Kim is the short one, Kai is the fat one and Kail is the tall one. Kim claims that he is the strongest Pokémon Trainer in Virdian City, with Kail and Kai respectively claiming to rank second and third.

The Invincible Pokémon Brothers are incredibly arrogant, claiming to be well-known worldwide and picking on those that they consider to be weaker than themselves. However, beneath these exteriors, they are nothing more than petty cheaters who constantly use dirty tricks and refuse to follow rules. For example, they would have their Pokémon fake being incapacitated and then hit the opponent when their guard is down, even when said opponent was trying to help. Another example is when the battling brother is losing, the other two would send out their Pokémon to gang up on the opponent(s).

The brothers are delusional and self-righteous to the point that they actually believe they are not cheating at all and will even argue that they acted fair and square if their cheating is called out. For example, when Misty called them out for illegally sending out two additional Tentacruel to attack her Corsola in Cerulean Blues, Kim stated that it was a challenge from the Invincible Pokémon Brothers as a whole, disregarding the fact that the match is supposed to be a one-on-one battle. After Nurse Joy disqualified them for the rule violation, they argued back, declaring that they won "fair and square", which resulted in her additionally banning them from all official Pokémon matches.

The brothers are capable of great acts of cruelty, such as when they had their Tentacruel attack Misty's Gyarados with Poison Sting in order to try and force Nurse Joy to lift their ban and give them the win, and even more so when Misty dove in to shield Gyarados; not only did they have Tentacruel attack Misty, but they were also amused when she was in danger of drowning. In the end, they became cowardly when they realized that their defeat was inevitable; they panicked and attempted to surrender in a pathetic way, only to be sent blasting off with all of their Pokémon.

(Source: Bulbapedia)