Phenac City is an oasis in the desert of Orre. It is the first town Wes arrives at in Pokemon Colosseum. The town is plentiful in flowing water and lush plants, creating the feeling of a tropical paradise.
In Pokemon XD: Gale of Darkness, the town is the subject of an attack by Cipher that involved the Cipher peons disguising themselves as the townsfolk while the real residents were locked away.
Shadow Pokemon (Colosseum)
(Gale of Darkness)