The Unknown Dungeon must be surfed to from the Nugget Bridge in Cerulean City. It is home to the most powerful and rare Pokémon in the world! But first, you will notice that this time the Unknown Dungeon Is Completely different from Red And Blue so expect to get lost so look at the above correct maps of it in Yellow. There aren't any trainers inside, but there are items and Pokémon to be had including the rarest of them all. When you fight Mewtwo, Make sure you either use your Master Ball on it or have it frozen/paralyzed and at LowHP
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