Onix is one of the Pokémon that resides of an island among the followers of the Meowth of Bounty.
When Team Rocket's Meowth land on the island and could not use Pay Day, Shimajio suggested that this could be a test of their beleifs and decided to give Meowth some battle experience on the island's battle arena in an attempt to make to learn Pay Day.
Onix battled Meowth after hitting it with its tail and then using wrap on it. The battle was interupted when Jessie and James had aided him by throwing their remaining money and bottlecaps to make it look like Meowth had used Pay Day.