whats the best way to go through this tourny with getting the 15000 u need to complete jiminys journal?

You can EASILY earn 15,000 points in just the levels 11-19. Since you can use your summons freely, use Stitch. When you summon him, immediately use his limit and hit the SQUARE button rapidly. This will make him use the Ukelalee (hah... Butchered that spelling, sorry) move. Make sure you use the right analog stick to get all the enemies in the camera. Using this makes all of your enemies drop coins. Most of the time, you can get about 2,000 per round (or, at least that's what I got per limit). As soon as the limit time ends, use it again.