which game should i nuzlocke first?

i'm getting my first ds console tomorrow, a 2ds xl (so excited lol) and wondering what i should play first!! it has all the pokemon games pre downloaded and i can download any if missing because it's modded. i've only played SV before and i'm currently in the middle of a nuzlocke of ut, but i'm enjoying it a lot so i thought i'd get straight to a nuzlocke on my new 2ds as well!! (also feel free to tell me if this is a bad idea and i should start with a plathrough first, as i mentioned ive only played SV so i'm not sure about the difficulty of the other games). but anyways yeah i would appreciate any recs/suggestions!!