Oceanview Gym is the first one of Glazed series. It's the Electric-type specialist of this continent and considered one of the hardest ones - so hard it was nerfed in Blazed Glazed.
Beating Oceanview Gym will earn you TM24 (Thunderbolt; in Glazed) or TM34 (Shock Wave; in Blazed Glazed), the Jolt Badge (raises pokemon's attack) and enables you to use HM01 Cut outside of battle.