Forrest is Brock's younger brother and the second oldest child of Flint and Lola. When Brock returned from Johto to find the gym taken over by his mother and her water pokemon, Brock decided to have Forrest run the gym in his place. Helping Forrest out is Brock's prized pokemon Onix. Forrest was able to raise Onix very well that it ended up evolving into a Steelix.