Arena Tycoon Greta (Japanese: アリーナキャプテン コゴミ, Arena Captain Kogomi; French: Carole; German: Greta; Italian: Valentina; Spanish: Coro) is the Frontier Brain and leader of the Battle Frontier's Battle Arena. Her English name is similar to "guts". Her French name cames from "courage". Her German name derives from "grob". Her Italian name is similar to "valente"("skilful"). Her Spanish name could be a misspelling of "Cora", a Spanish name similar to "coraje"("courage").

Greta can be blunt, and if an opponent looks weak, she'll let them know. She likes tough trainers, and will gladly hand over the Guts Symbol if defeated.

In the games

In Pokémon Emerald, Greta has these Pokémon when you fight her for the silver Guts symbol:

• Heracross
• Shedinja
• Umbreon

In Pokémon Emerald, Greta has these Pokémon when you fight her for the gold Guts symbol:

• Umbreon
• Breloom
• Gengar

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