Not sure, but normally, you have to buy it. If you're advanced in hacking, you can try stealing it - not recommended, as you will be an @ole, lots of people will hate you, and you will probably die alone.
But if you're not a hacker, than the only ways I'm aware of, are to buy it for fiat, or to help someone and they would pay you in return in BTC, but most likely it is a case of buying it with fiat.