Y only X-link Kai?
Is it an adhoc connection? (i have it but havent checked)

If that's the case you can also opt for Ad-hoc party on PS3, but not sure how many people you'd find unless you recruit from the forum or so forth.

Ad-Hoc:free ps3 download via psn japanese store that allows psp games that connect via ad-hoc (not infrastructure) to play online using the ps3's wifi connection. But you must connect your ps3 to the net via ethernet, so wifi can be used with your psp->ps3.