Registration paper for a used bike

Hello. 3 quistions: 1: I want to buy a used Mc in Delhi. Can I, as a Danishman, buy a used Mc and get it registered in my name? 2:And if I can. How long time is it before it’s registered and I get the papers in my hands? 3: Do I have to be present to register the bike or can somebody else do it for me?