Hacker on Don't Forget

I was in a battle with this guy named "SANSfrancisco" and when battling him, he used more than 8 items, and he has a yellow name and sans (he used it in battle.) At LEVEL 1. So I am pretty sure he's hacking. Most of the reason is that he is always level 1 and has more than 8 items in battle. (Also he used the Sans costume in battle.)