I don't have cheats or a trainer, but I can give you some guidance. The game can be challenging at the beginning until you build your party up. I would start by recruiting the Ranger just north of the first temple. Next, head to the swamp southwest from the starting village and recruit the witch. Then, if you really want to be overpowered, talk to the farmer just north of the starting village, rescue his cow, and refuse to return her, as the cow is a really powerful party member. That will give you a really strong initial party.