Sometime prior to the episode, Locke was Ed's locksmith apprentice. Over time, he became frustrated and felt he was not respected by Ed, Locke ended up quitting. While Ash and his friends were about to check out a gem exhibit in Jacore Town, Locke waited on the rooftop. When it was nighttime, Locke came in from the rooftop and picked the a diamond exhibit's lock which sounded the alarm. Before leaving, some guards came by. Locke ended up escaping after throwing his calling card. The guards found that the gem was still in its case, and it was later revealed that Locke's criminal alter-ego "Master Thief Keyes" only intended on unlocking Ed's handmade locks to prove his own worth.
Later, Team Rocket came by and had Locke use his locksmith skills so that the trio could steal Pokémon from a nearby Pokémon Center. Locke pretended to agree with them as he wanted Team Rocket to free him from the device they used to restrain him. However, Locke ended up backing out of the deal and claimed that he doesn't steal. He had his Binacle, Lefty, use Brick Break on Meowth. Team Rocket ended up chasing Locke with their Inkay and Gourgeist. Inkay's Psybeam and Gourgeist's Seed Bomb accidentally blew up a generator to the Pokémon Center and this blasted Team Rocket away in the process.
As the Pokémon Center was set ablaze, Locke went inside to rescue the Pokémon but was trapped inside. Locke yelled out for help and Ed's Binacle, Righty, had Bonnie go to Ed for help. Ed arrived at the scene and instructed Locke how to pick the lock from the inside. The pair were able to escape the blaze, with the incident reestablishing trust between them. Although Locke was arrested by Officer Jenny, he was let off with a warning, something that Ed told Ash and his friends to keep a secret.
Shared with Ed
This article is missing information on this character's Japanese voice actor. You can help by adding this information.
Locke owns an "arm" of the Binacle which is nicknamed Lefty (Japanese: レフトLeft). Ed owns the other "arm".
Lefty first appeared assisting its Trainer in picking the lock that guarded a beautiful gem. It later appeared in a forest with Locke, being thanked for its help. Later, when Locke successfully tricked Team Rocket into freeing him from their restraining device, it used Brick Break on Meowth and fled with its Trainer. In the ensuing pursuit, Team Rocket accidentally set fire to the Pokémon Center.
When Ash and his friends reached the Pokémon Center, it finally met with Righty and then helped its Trainer in rescuing the Poké Balls from the ablaze building.