Use PKHeX, if you have a homebrew installed along with checkpoint you can backup the game, put your SD in a computer, find the save and upload it to PKHeX, then you can edit your: Pokemon, Number Of Badges, Items, And More
Omg do you know how much money I would spend if that was a thing? Especially if you get to assemble the gundams somewhat like those old model toy kits. The answer is zero dollars. I would spend zero dollars. It would still be so good, though.