Bruce, Chan

ブルース・チャン

The Invincible Pokémon Brothers are extremely arrogant, asserting that they are famous globally and bullying those they deem weaker. Yet, behind this facade, they are merely petty cheaters who rely on dirty tricks and ignore rules. For instance, they would have their Pokémon pretend to be incapacitated, then strike the opponent when their guard is down, even if the opponent was attempting to help. Another instance involves the battling brother losing, prompting the other two to release their Pokémon to gang up on the opponent(s).
The brothers are delusional and self-righteous, genuinely believing they are not cheating and arguing that they acted fairly if their cheating is exposed. For example, when Misty called them out for illegally sending out two additional Tentacruel to attack her Corsola in Cerulean Blues, Kim claimed it was a challenge from the Invincible Pokémon Brothers as a whole, ignoring that the match was supposed to be one-on-one. After Nurse Joy disqualified them for the rule violation, they argued back, declaring that they won "fair and square", which led her to additionally ban them from all official Pokémon matches.
The brothers are capable of significant cruelty, such as having their Tentacruel attack Misty's Gyarados with Poison Sting to try and force Nurse Joy to lift their ban and award 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. Ultimately, they became cowardly upon realizing their defeat was inevitable; they panicked and attempted to surrender in a pathetic manner, only to be sent blasting off with all of their Pokémon.