where is that in the debug room?!
1) You have to get a save file which contains all party members and has location in Debug Room on Disc 1. (Use Jenova)
2) When you are in Debug Room go to Yuffie and select "menu on"
3) Open your PHS and choose who do you want do date (Cid and Vincent is MUST SEE)
4) When you finish go south.
5) Now go west and talk to the middle Yuffie.
6) Choose "kanransha naka" and have fun!
I don't know if this works on PSX version...