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Technically a gym leader team, but one with a theme beyond typying: Swamp/wetland pokemon, since I love swamps, and these are basically my favorite poison types (mins tentacruel), and poison are my favorite types
Gengar might not seem very swampy, but I figure spooky shit would fit well in a swamp, and it tties into the gym theme itself, which would be half sunken, Messoamerican (Ex:Aztec and Maya, though there's way more complex mesoamerican civilizations then just them) ruins in the swamp itself, like the Woodfall temple in Majora's Mask