Another King Boo Crown Gem.
There is another place in the mansion beside the King Boo Battle where you can get the gem found in King Boo's crown. To get it, first, you have to get the water elemental medal and gain access to the balcony on the third floor where Boolossus is. Be sure to have water in the Poltergust 3000. There is a group of plants in the northeast corner of the balcony. Use the water to water the plants and a King Boo crown gem should pop out of one of them.
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