Steelix was first seen in a flashback in where it was shown battling Barry's Empoleon. Steelix lost the battle.
Steelix later appeared when he was the second Pokémon to be called out in Byron's battle against Ash. Despite being at a type disadvantage, Steelix displayed incredible power by easily defeating Ash's Buizel. Steelix then battled Chimchar but Chimchar managed to dodge Steelix's attacks and used Dig to weaken the battlefield. Due to Steelix's massive weight, the ground beneath it eventually collapsed and Steelix was defeated by Chimchar's Flame Wheel.