When does the Devil Social Link become available in P3p?

Answer 1

I don't know what to say.

http://www.youtube.com/watch?v=YcPiILQCZnc

Answer 2

It becomes available when you get to this part:

Get to Hermit level 4, and Maya mentions an old man standing outside of Paulownia mall. Keep on donating to this man (He should be standing near one of the benches on the right side of the mall) until you finally get to start talking to him. This social link doesn't require a Persona to raise/gain points for it, it levels up naturally each time you talk to him.

source:http://www.gamespot.com/ps2/rpg/persona3face/answers.html?qid=79334

Answer 3

Search it on Google.