If you want to find a lot of cheats even on any game go to google web and type in chrono cross then a new web site will come up and you can get profiles cheats music and more (this works for any other game just click ps 1 on the top left and all the games will apear!!
If you go back to Arni Village in the second world, go to Gonji's hut( Gonji's hut is the one with the Record of Fate in it).
Once there, go to the room to the left where Gonji is. A picture with a japanese symbol is hanging on the wall.
Walk up to the picture and hit "x". A box will come up and say "(your name) received a Tablet. (I am not really sure if it is a tablet or not... it might not give you the same thing over and over again)