You have to have a fire wizard quest that needs you to go inside. Otherwise, it will be locked.
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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.
Defeat Claire in Blackthorn Gym and she will allow you in to the cave at the North of Blackthorn.
The AP is the Abandoned Page, where you can find dragons that people no longer want.
Well there aren't probably any dragons alive today (but they have existed), so there is no such thing as dragon den's anymore. But It's probably a large cave.
Go behind the gym, surf across the water there and you'll find a cave.