Is it important?

I heard that Pokemon Azurite is coming out in 2023 (my frnd told me) and I searched the game. Found out ‘The Suzerain’ is a part of this.

So I was wondering that are there any post-game quests which are imp/mandatory to know the plotline of Azurite. For eg, I know Taen’s quest is related.

Thus I just wanted to know which post-game quests premiere/portray some plot of Azurite?

The Taen cutscene is just a cameo. The games are otherwise not at all related.

what about Delta Beldum (ruin) appearently Taen and Delta Beldum (Ruin)'s Evolution line are both in Azurite