From Bulbapedia, the community-driven Pokémon encyclopedia.
Silver Town (Japanese: ジルバタウン Jitterbug Town) is an anime-exclusive town in Kanto. It is located between Saffron City and Lavender Town.
Its only appearance came in Weekend Warrior. In that episode, May competed in a Contest to win her second Ribbon. In the end, she won the Ribbon by defeating Jeremy and his Venusaur.