>>57412361Monotype runs are boring to me, specially in newer gens. Between secondary types and coverage moves, monotype teams end up being about as diverse as most vanilla teams, if not more.
Nuzlockes and the like are fun but it is easy to get sick of them if thats all you do. There are only so many gimmicks you can pile on them to keep them fresh.
Not really a challenge run but recently I did a Gen 1 living dex and it was surprisingly fun. It is a nice middle ground between a harder casual run and a unoptimized speedrun where you really have to focus on other gameplay mechanics besides just battling.