I guess you're right. I just went online and joined another group. Although the boss was Xerneas, and we still lost, I fared better this time. Helped that Xerneas got to just 15% of its health before we got to four KOs. Didn't matter. Got a Shiny Seadra, and was able to advance the story.You are just unlucky then i guess. The NPCS aren't as moronic as the generic ones.
UPDATE: Don't know how, but my second attempt with Xerneas was not only a victory, but I got a Shiny Xerneas.
Looks to be it. Word of advice if you shake the Dyna Tree: I battled a Level 100 Greedent in a Max Raid Battle. Not catchable, but winning nets you dozens of berries, including Lansat and Starf.Crown Tundra is post game?