Any battle modifications will result in the unexpected error, after some testing. So it seems that god mode, infinite bb and infinite items cause unexpected errors. This is due to Gumi now detecting this. There's nothing on the part of the mod that can be done. There seems to be a small workaround for infinite battle items enabled for Grand Quest, which is what all I tested it with. See a few pages before this for it.
Secondly, the hacks do not interfere with WVA or arena whatsoever You need to battle someone who has 3000+ points higher than you in order to get 200 points. Battle someone lower, you will get smaller points. Battle someone who has a significant amount of points less than you will result in you getting a significantly low score, just like your 10 points So, look for people in arena who have roughly 3000 points higher than you so you can get better points.