You can get a perfect shiny using Pkhex. And it's as legal and as valid as a shiny gotten from 9348348958 attempts with a shit nature and ivs. And if you are too autistic about it and it feels too perfect you can also randomize its values. Spending hundreds of hours resetting your game or running back and forth to get thousand of wild encounters just to get a Pokémon that you (and everyone else) could have in 5min seems extraordinarily autistic.

You should be ashamed of yourself for wasting your life away on this shit