Brock caught Forretress as a Pineco near Azalea Town with one of Kurt's Fast Balls while trying to pick Apricorns.
The day Team Rocket sent out
their 'Plucky 10 Times Over' Robo Spinda to capture all the Spinda and Claire
's "Lucky Spinda", Brock's Forretress
was sent out to battle against it. Brock
knew he needed a powerful attack as his Brock's Mudkip
and his Brock's Lotad
weren't even able to scratch the surface of the mecha. Knowing that his Forretress would suffer, Brock
told it to use Explosion on the mecha which proved to be very effective as it was powerful enough to destroy the mecha.