[Spoiler] What to do after beating Taen?

I have beaten taen at the dragon ruins again and saw the cutscene between him and reukra where he gives the azure flute to him. However, when i go the perfection cult base after that, there is nothing there (there is only a pokeball behind a locked door that i can’t open but nothing else) nor at the spear pillar. What should i do?

do some more story events for a while, and revisit the base here and there. when there’s a note, you’ll know what to do