Dark Cloud 2 Cheat Codes
When you get Erik in Chapter 2, go up to him and add him to your party. Press Triangle to go to the menu and select "Character". Select Erik and use his ability to make bombs. Then, send him back to the train and sell them. Keep going back to him when his skill points increase. Do this repeatedly. Each of his bombs cost 150 Gilda.
Easier Level Ups
Take one of your strong characters (i.e., most health, strongest weapon) but not the Ridepod, and go to a dungeon that you can get minimal damage done to you. Kill the enemy with your strong person, and immediately afterwards, press L3 to switch characters or R3 to switch to the Ridepod. This is especially useful when trying to build up the Ridepod since he loses fuel easily. This makes it so he does not move or get hurt.
To get some free items, get Polly and/or Ferdinand to accompany you on your journey. When you are on the train, add them to your party. Press Triangle and go to character. Go to them and use their ability to gain free items. Parn is also a good character to get. Put him in your party, and if your better character dies, use his special ability to leave a dungeon for free.