I've never seen anyone else bring this up and it's been on my mind for a bit, so I figured I might as well.
This is an opportunity to get these stones in Malie City immediately before the Aether Foundation. The Dusk Stone is usually found near the start of Poni Plains, while the Shiny Stone is around the end of Ancient Poni Path. This means that depending on the version, you can get one or the other much much earlier as you can immediately go back to Malie City after Gladion forces you on the boat to the Aether Foundation. Therefore; the viability of Minccino, Flabebe, Litwick, Honedge and Murkrow are directly affected depending upon which version you are playing (and as a side note, so are Misdreavus and Roselia in SM). Should we seriously consider this in tiering?

This is an opportunity to get these stones in Malie City immediately before the Aether Foundation. The Dusk Stone is usually found near the start of Poni Plains, while the Shiny Stone is around the end of Ancient Poni Path. This means that depending on the version, you can get one or the other much much earlier as you can immediately go back to Malie City after Gladion forces you on the boat to the Aether Foundation. Therefore; the viability of Minccino, Flabebe, Litwick, Honedge and Murkrow are directly affected depending upon which version you are playing (and as a side note, so are Misdreavus and Roselia in SM). Should we seriously consider this in tiering?