Silver

Silver is a supporting rival character that steals his second Pokemon, Totodile from Professor Elm. He replaces Blue in Pokemon: Gold Star for a bit of time.

Biography
Silver is extremely secretive as he is contacted by another person through his Pokegear. The person on the other end of it gives him commands to keep watch on Machine and the other Pokedex Holders. However, when Gold was hurt by the Masked Man, Silver actually came to warn him, much to his benefactor's chagrin. Silver warned Gold not to be as careless as he was beforehand. He also told him that Masked Man would now be on him, trying to kill whenever he got the chance.