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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by capturing an ice pokemon in the ice cave by capturing a dragon type pokemon but dragon is weak against dragon so just capture an ice pokemon
By beating the gym leader Clair in Blackthorn City.
Dragon and ice types defeats it
It is in the middle cave of Mt.Mortar, it takes surf and waterfall to eventually get to it
It's own kind (dragon or gohst)