actually its impossible to hack the game(theres a device for modifing your save game but u should google for it), u shouldnt be asking for this kind of things on this forum, its just my opinion.
so i know u arnt in for hacking but its many posts here with hacking like room hacking etc but so there isnt any way to hack the game so it gives u 200 x xp gain or something like u could in ds pokemon hs and ss