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• Arbok
• Crobat
• Golem
• Graveler
• Grimer
• Koffing
• Magcargo
• Magmar
• Mawile
• Nidoking
• Nidoqueen
• Onix
• Raticate
• Rhydon
• Sandshrew
• Sandslash
• Steelix

This dungeon also features Groudon as a boss.