10840 Bonus Stats (Statistician, Manager, Armsmaster, and Broker)
Get your customer rank to about 6+ and pass the "Eyewear Inventory" bill. Go to the Battle Depot and check the glasses section. If you see "Foresight", go to it and check if there is a pre-subdued specialist already on it (orange circles). If so, buy it but do not equip it. The only thing it is good for is to move the specialist onto another piece of equipment and equip that. If you equip the glasses themselves, you will not be able to move. There is also another item with a similar glitch, called "Tainted Staff". It is usually a pre-subdued "Alchemist - 11026"
Greater enemy level
When you lift up an enemy and throw it at another, their levels will combine, and stats will increase marginally. However their maximum HP and SP will not. This trick is also a way to get more experience points from an enemy.
Transmigrating (Rank 3 bill)
When you plan to transmigrate, do it at a higher level than the level you previously transmigrated from otherwise your stats will decrease. For example, if you have a Prinny God at level 3,000, transmigrate and level him to level 1,000; if you were to transmigrate him at level 1,000 his stats would decrease rather than increase. Also, it is highly recommended you always transmigrate under "Genius".
Unlimited hospital points
Get a piece of equipment that increases HP. It is recommended that the Hp increase be a large amount or this will take longer. Equip it, then unequip the item. Equip it again and your HP should decrease from the max HP. Use this gap of HP to heal yourself, thus giving yourself points. Repeat this for hospital points. You should have a large amount of money to do this repeatedly.