To get into Dragon's Den, you need to have beaten Clair (Blackthorn City's gym leader). Once you have beaten her, the old man standing in front of the entrance will have moved.
You might want to heal your Pokemon after battling Clair as there are trainers in Dragon's Den.
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you can get a dratini from a guy in dragons den in blackthorn city or you can catch one in the water in dragons den
only dritini unfortunately
dragons den
Dragons Den.
in dragons den you can also catch dratini's in there