I've tasked myself with trying to get a full shiny living dex this year, making a ton of fast progress using gen 7 RNG manipulation. I know some folks see it as cheating, but I'm only getting these for myself (and anyone that wants one for themselves!), and I enjoy the process of it!
That's 100% my stance, I feel like RNG manip is a way to reduce time in a way that requires a little bit more skill. I think having the ability to add challenge by removing certain factors (shiny charm, mass outbreaks), or by hunting specific versions of shinies (huge, tiny, marks, etc) are part of what makes Pokémon so much fun.