Gengar is a ghost type of Pokemon. You can get it using the duel slot by putting FireRed into the Gameboy slot.
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You can find it in the Great Marsh with dual slot Firered. Dual slot means you put diamond in slot 1 and Firered in slot 2.
Wild Gengar can appear in the Old Chateau if you have Ruby, Sapphire, Emerald, FireRed, or LeafGreen in the GBA slot. In this case, it has a 4% chance of appearing.
You find ghost Pokemon and rotom. And if you have any Pokemon game in your gameboy slot you can also find gengar.
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To get a Gengar, you must trade a Haunter and it will then evolve into a Gengar.