From Bulbapedia, the community-driven Pokémon encyclopedia.
Silva (Japanese: シルバ Silva) is a young man from Pyrite Town who is widely considered as Duking's best friend, lieutenant, and right-hand man. Brave, loyal, but more than a little foolhardy and luckless - Silva attempts to fight Cipher throughout Pokémon Colosseum but has little luck.
When Miror B. kidnapped Duking's Plusle and used it to intimidate Duking into letting Cipher have free run of the town, Silva made a rescue attempt. Silva snuck into Miror B.'s Hideout, but was eventually thwarted and injured by two of Miror B.'s lackeys, Reath and Ferma. Following that, Silva was rescued by Wes and Rui, who arrived in the nick of time.
Silva continued to investigate Cipher's actions in Orre, though. He later attempted to explore the Under, but was captured when he was mistaken for Wes. He was eventually freed after Wes liberated the Under from the control of Venus.
Silva later disguised himself as a Cipher security guard and infiltrated Realgam Tower.
In Pokémon XD: Gale of Darkness, Duking has handed Silva the responsibility of running Pyrite Colosseum. He plays no significant role.
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