It was something I wanted to avoid, but it's because I want it to be in a master ball which can only be done on its second encounter, and it's nature will be locked then. So when I said resets, I meant total game resets, not just the encounter. I probably should've mentioned that. But I don't see how a nature change would have any impact on the ribbon quest.
And yeah I guess the IVs don't matter because I can max them in the current gen, but I still would like to be able to use it competitively so I want a good nature.
Anyways I wasn't expecting to get a reply as detailed as yours so I really appreciate it. I think I saw your vids on YouTube, SteamRollr rings a bell lol.