There is a special Marshadow, Volcanion, & Genesect distribution available via mystery gift in Pokemon Sword and Shield ...
There is a special SHINY Eternatus distribution available for Pokemon Sword and Shield before Pokemon Scarlet and Violet release. This runs in US, Canada, Australia, New Zealand, Philippines, Singpore ...
With other factors like the score and side missions being so uninteresting, we can arrive at a conclusion for Legends: Z-A.