This is my savefile before and after the champion http://www68.zippyshare.com/v/Gwatuv6h/file.html
BTW:Its in spanish but the language can be edited with pkhex
Delete NAND and SYSDATA folders from bleeding edge and copy the same folders from 9-24 gdmk tieba baidu build worked for me
For the cheats,download the txt from https://gbatemp.net/threads/pok%C3%A9mon-moon-gateshark-ntr-request.447851/page-5 a
I bypassed that trainer playing with this -> https://gbatemp.net/threads/pokémon-rutile-ruby-and-star-sapphire-or-as-challenge-mode-romhack.400937/
I couldnt find any *.3ds in there but if you google "<snip>" you have it.