Its voice actor in both Japanese and English is 石塚運昇 Unshō Ishizuka.
Bruno came to Mt. Hideaway near Pallet Town, to capture one of the giant Onix that has a scar in its right eye. which was rumored to be roaming about the mountains.
When he finally found a giant Onix, it was attacking Ash and his friends. After rescuing Ash, he tried to calm the rampaging Onix. Even though it tried to attack him, he dodged it easily.
Bruno knew that something was wrong with it. So he managed to calm the Onix so that he can find the problem. It was a Sandslash stuck inside Onix that was hurting it. After Bruno removed the Sandslash, Onix wanted to come with Bruno, so he captured it.
Moves used