You have to beat the gym leader to gain acess to the Dragon Den. (the 8th gym leader,the on in the town)
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you cant get into the shrine
only dritini unfortunately
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
In Pokemon Crystal you can find Dratini in Dragon's Den and Route 45. To find and catch Dratini you will need to use the Good Rod or Super Rod.
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.