In the anime, Brock is a Pokémon Breeder and a former Gym Leader of Pewter City who is a close friend and traveling companion of Ash's. Some notes on official sketches of his character set his age at 15 at the start of the series.
He originally trained Rock-type Pokémon, but has, since the second episode he appeared in, diversified. As he has stated in Battling A Cute Drama!, his philosophy is that the important thing about being a Pokémon Trainer is the bond between Trainer and Pokémon. He is an experienced cook and caretaker by nature, so he always makes scrumptious food both for pokemon and for humans.
One of his best known character traits is that he falls in love with every pretty woman he meets, particularly Officer Jenny and Nurse Joy. He can tell whether they are real (women) or impostors as well. This "ability" has been used multiple times in the series. He has always held a supporting role in the series, usually contributing more in terms of wisdom and comedic antics than the action and battles of the series.Early on, he showed that he carries around a Boulder Badge for identification. He also has a Contest Pass for the Kanto region, though he only used it once, as well as one for Hoenn which was required to watch a Contest there.