There a save editor for this game just back up a save transfer to pc and use the editor. There a in game item that works as a experience multiplier you can also edit
https://github.com/Synthlight/Nexomon-Extinction-Save-Editor
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My two posts have been merged whats below is about disgaea 6
I been trying to create codes but it's difficult. You can edit your stats because they are so high they are unique values and money easy to find as well. Also you the saves use ykcmp compression but the decompressing program doesn't work with this save so you can edit the saves. the only code i think works or at least for me is exp here it is for 30x exp but it can be increased just changed the 0BB8 at end.
[exp x30]
580F0000 00F01C20
580F1000 00000008
580F1000 000019F8
580F1000 00000008
580F1000 00000000
780F0000 00000020
640F0000 00000000 00000BB8
for some reason i find the other stuff like mana and money multipliers but when i create a code it seems to be save specific eg i load save 1 they work load save 2 they don't.
searching for stats is easy just go into edizon do a u64 search when you find it change it edit it. if you then do a memory search of result you can find the other stats. money is search money spend or sell something search the results of previous search for money edit what's left. one solution i read for the problem with make codes for this type of game is to use the dump files and find pointer with cheat engine
also i included my saves they are at begin i have edited a few things in it money, cheat points and main characters stats