>>37512920USUM is actually pretty brutal if you turn off Exp All, if you don't grind you get bodied constantly, honestly it makes the experience kinda fun
>>37512931X items absolutely break the game if you use them properly, you could easily beat the entire game with any shitmon if you had enough of them. Basically, being able to set up and boost stats "for free" is major, ESPECIALLY in gen 7 where X items went from +1 to +2