a powerful team
Blue is both a trainer and a gym leader, and uses two separate teams to complete his work related duties and his personal endeavors. Blue spends most of his time training his Pokémon and himself and both of his teams are incredibly strong.
Blue's Main Team
This is the team that Blue uses during most of the manga. Occasionally one or two of the pokémon seen below will be switched out for a Pokémon from his gym team however, that is rare. An interesting fact about this team is, Blue's first Pokémon was his Scizor (a Scyther at the time) not his Charizard. Also, according to the manga, Blue's Porygon2 loses levels instead of gaining them.
Blue's Charizard
Level: 81(Ch.180), 89(Ch.275)
Personality: Bold
Ability: Blaze
Info: Blue receieved it from Prof. Oak when it was still a Charmander. It's kind of like Blue's child (Ch.275).
Blue's Golduck
Level: 79(Ch.180), 88(Ch.275)
Personality: Serious
Ability: Cloud Nine
Info: It possesses high psyhic abilities and can read the minds of and humans. Golduck can seek out hidden enemies (Ch.275)
Blue's MACHAMP
Level: 70(Ch.180), 80(Ch.275)
Personality: Shy
Ability: Guts
Info: It happened to evolve just after Blue traded for it with Red. With its strong arms Machamp throws opponents far away (Ch.275).
Blue's Scizor
Level: 80(Ch.180), 82(Ch.276)
Personality: Docile
Ability: Swarm
Info: When Blue needs to read his opponents moves there is no better than Scizor. Chuck trained them both (Ch.276).
Blue's Rhydon
Level: 71(Ch.180), 82(Ch.276)
Personality: Gentle
Ability: Lightening Rod
Info: With his Rhydon and the "Mysteries of the Earth" book from Viridian Gym. Blue has become much stronger (Ch.276).
Blue's Porygon2
Level: 81(Ch.180), 79(Ch.276) (What?!)
Personality: Trace
Ability: Moody (So moody it loses levels?)
Info: It was originally a prize at the Game Corner but is now a trusted member of Blue's team. (Ch. 276)
Blue's Viridian Gym Team
When Blue became the leader of the Viridian City Gym Leader he trained a team to stay at the gym so he could battle trainers even when he wasn't at the gym. The team is still slightly weaker than Blue's main team however, they are able to easily take down Yellow's Pokémon (Ch.287).
Blue's Exeggutor
Level: 67(Ch.180)
Personality: ???
Ability: Chlorophyll
Info: Blue caught his Exeggutor during a Pokémon Rampage due to the radio signal. It is almost never used.
Blue's AlAkazam
Level: 64(Ch.180)
Personality: ???
Ability: ???
Info: Blue caught his Alakazam during a Pokémon Rampage due to the radio signal. It easily defeated Yellow's ChuChu.
Blue's Arcanine
Level: 71(Ch.180)
Personality: ???
Ability: ???
Info: Blue caught his Arcanine during a Pokémon Rampage due to the radio signal. It is almost never used.
Blue's Pidgeot
Level: 76(Ch.180)
Personality: Hardy
Ability: ???
Info: Blue's Pidegot used to be a part of his main team. It often is seen carrying letters between Blue & his grandfather.
Blue's Ninetales
Level: 68(Ch.180)
Personality: Modest
Ability: Flash Fire
Info: Blue and Red worked together to catch this Pokémon but Blue was the one who claimed it.
Blue list of Pokémon is quite long. In fact he holds the most Pokémon out of any of the Pokédex holders (Ch.180). Sometimes Blue ends up holding onto other character's Pokémon, for example Blue has taken care of: Golbat (Koga), Ivysaur (Red), Pikachu (Red), Poliwrath (Red), Zapdos (Green), and Lapras (Random kid).