I found an answer on the discord. They are encrypted so they are hidden.
Legomad999
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A member registered Sep 19, 2024
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Near the rare grass in Pallet town, there is a spot where you can select a ghost type and go hunting at night. You can do it with Gastly by not the other two. It doesn't even give a message if you select either of the other 2, just puts you back into a walking state. I'm guessing they haven't been added yet.