From Bulbapedia, the community-driven Pokémon encyclopedia.

The name "Marina" can refer to three characters:

• The female trainer from New Bark Town; see Marina (Johto)
• A character of the day from the Orange Islands who owns a Psyduck; see Marina (Orange Islands)
• The Colosseum Leader of Waterfall Colosseum from Pokémon Battle Revolution; see Marina (PBR).