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Dumb idea: catching every single pokémon in the Great Marsh gives the player access to an incredibly harsh & foggy area of the swamp, with the pokémon living there being much more powerful and hostile as well. Sliggoo -which could be found in the Great Marsh along with Goomy - evolves into Sinnohnian (that sounds terrible i know) Goodra by reaching Level 50 in this place. Contrarily to regular Goodra, this one is your typical frightening swamp monster, known for grabbing people and pokémon with its slimy tentacles, beating the piss out of them etc. etc. you know shit like that. I'm not sure about what its typing would be though, i was thinking Dragon/Poison but it's kind of overused, plus we already have Dragon/Dark & Dragon/Ghost pseudos