So I don't understand... idk if it just hasn't updated, or what, but my Festival Plaza Rank is 52, and I've beat the Pokémon league, caught the ultra beasts, unlocked the super battles at the battle tree, and even beat master rank in the Battle Royal.
So I can't imagine what the problem is, other than "encountering" semantics? Like, maybe it didn't count because I chained it instead of just experiencing a random shiny Pokémon pop up on the first try?
Basically, I spent 3.5 hours chaining Ditto's on Mt. Hokulani, which paid off, I got a blue shiny ditt, I named it 'Blue Goo' and it's now in the day care center to hatch eggs.
And yet the Miscellaneous Ranking on my friend's Pokémon Moon says I have encountered 0 Shiny Pokémon!??