1.to download Ad Hoc party on your ps3, which you can find on the PSN store (free download), then it installs.
2. you run it and from there you fire up dissidia on your psp and go into a lobby
3. on the main menu of Ad Hoc party, goto the button that finds or searches for a game, then it should pick up that you're in dissidia, then it should take you to the world selection screen and you can pick one and search it for anyone also playing dissidia.
i just got my ad-hoc on my ps3. My buddy and I have recently gotten really into playing and have been wanting others to play against. Anyone interested?? Im online now and am having a VERY hard time finding any others that play... -__- T__T