The last four missions in Jiminy's Journal are for The Paradox Battles high scores. All four. Tips please.

Stitch or Peter Pan really help racking up a high score. Also equip as many Jackpots as you can, including Wishing Lamp. Hope this helps mate!

 

Peace!

Get to low health and use stitch. He will keep using his ukulele attack on the monsters as long as your health stays below critical. It's a bit risky but this will get you points fast and easily.

Use Stitch, he's a god-saver. Use Ohana and his Ukelele.

For Pain and Panic and the Cerberus Paradox Cups you just have to get high combos since you can't really use the Peter Pan and Stich summons in those cups and to get high combs you need to beat enemies fast in Pain and Panic using the limits really help getting those high combos, in Cerberus go to Master Form and just keep using Magnet and Thunder to dispose of the enemies fast.  For the other ones I say just use Peter Pan and the Magnet and Thunder strategy since every single hit to an enemy drops orbs you can also summon Stich and then use Magnet and then use Ohana and just use Ukulele (it's weird they shortened the Limit time for this in Final Mix since in the original you can use it four times if you have limit boast but even with that ability in Final Mix you can only use it twice which is weird) that's how I got the high scores anyway it will take time and when you fail you will have to start all over again, this is the worst in the Hades Paradox Cup.  

Keep the advice coming!