>>3869508
Pretty much what the other anons said, there's no real strategy other than pumping big numbers to over power your enemies and there's always some kind of trick or mechanic to over powering your characters super easily so don't be alarmed when you see stuff like lvl 9,999 and stats in the billions because there's usually an easy way to get to that point but still requires a bit of grinding. In the Disgaea series you gain levels like exp, basically you can reach a point where every time you kill something you gain dozens of levels.

And postgame is the only time where that stuff truly matters and these games have a lot of post game content. The story is like 1/3 of these games and you can usually beat it at around level 100 or less depending on the game.