Weird that Mesprit gets a holo and the other 2 are not even uncommon lol.
I guess this started in BW era;
- DP2: all 3 are Rare Holo
- DP5: all 3 are Rare, plus 3 corresponding Holo Lv.X cards
- BW5: Uxie (Uncommon), Azelf (Uncommon), Mesprit (
Rare)
- XY era: other than an XY-P promo for Azelf, this trio didn't show up
- SM5+: 3 cards with N/A* rarity
- SM10b: Uxie (
Rare**), Azelf (Common), Mesprit (Common)
- S10P: Uxie (Common), Azelf (Common), Mesprit (
Rare Holo)
* SM5+ was a rarityless set, but when translated for Forbidden Light, all 3 were Uncommon.
** Uxie was a Rare Holo in Unified Minds, the other two were Uncommon for the set.
Mesprit has been the odd-one out with the higher rarity twice now, Uxie once, and Azelf is just happy to be here.
In terms of how they're treated in the TCG, I think they're the only legendary trio to have been so quickly and so consistently "demoted." (It's not that they're the only trio who've had common and uncommon prints – Tornadus as a Common in SM10a immediately comes to mind – but the Gen 4 trio has never been given any EX/BREAK/GX/TTGX/V/VMax/Shining/Amazing/etc. prints, either.)