An egg on Dragon Cave does not need a certain amount of views to hatch. However, an egg needs 'unique views' in order to hatch. They will usually need a few hundred unique views.
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On Dragon Cave, you can not 'create' dragons. These dragons are found on the main page, either in the abandoned section or on the bottom of the page. Then they are either eggs or hatchlings, and if they get enough unique views, become adult dragons.
If you mean the friend area called Dragon Cave, these are the Pokemon that will live there when recruited: Bagon, Shelgon, and Salamence.
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You can't get eaten by a sea dragon in Hazy Maze Cave. Nintendo just want to scare kids by putting the warning sign in the cave.