For cheating (i.e max attack, defense, gold) use MV Cheat Plugin. Just put all the files in the games root folder and run MVPatcher. I'll link it at the end. And for a companion affection/corruption, I'll link a male and female save. You either have to edit the game through rpg maker if you want to make your own, or use the saves I'll link at the bottom. Just a heads up though, they were made with 1.5, so I cant guarantee they wont break at some point. And I plan on making new versions ever .x update, unless someone creates something that makes it easier.
Cheat Plugin-
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Female Save-
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Male Save-
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Delete the (1) on the male save. I dun goofed