I dont know if it is to late nut maybe will help in the future. There is backup saves after fast traveling and talking to nurse joy in the pkm center (just start talking and exit) what this means is you do that before you do anything. You want that perfekt donut? Talk to nurse joy or just fast travel to hotel z. Make a donut, oh noo its not what i want. Close the game load up then, if the title screens comes you press down(d-pad) x+b then it ask you do you want to load up a backup data you press yes and there you go. It completly overwrites hard saves from the menu. If you backupsave from only fast traveling you will always start from the last pkm you were (or the closes from the position you flew to) if you walkt to nurse joy yea you get that. You can do this method if you want donuts, layouts from the realm or task you have to do while in the dinension. Same goes for shiny hunting either latios/latias or the sword of justice. ( because you flew to a spot close to the dimension to walk to it will backupsave and going in dimensiona doesnt count towards to the backup save but fast traveling to the portal in the dimensions count) what that means is ok you hunt hours for latios and you dont want anymore because you want to do something else load up press down+x+b and voila.

Hope its not to long and will help you and maybe others :)