Mirage
Pokémon Trainer
Well. This seems fine!
Yep. Everything's under control, it's all fine™! (insert copyka2 emote here)
Yeah we really don't have
I think enervating the roots is a solid starting play, it'll slow them down which will hopefully help us dodge. I think to go with that, maybe the next best thing to try might be to poison multiple roots with Poison Jab? Fairy is particularly weak to poison after all, and if the root system is interconnected, and especially if we can hit multiple targets... then maybe the poison will spread, and help further weaken it?
Alternatively, we can also try to Catapult again and move Millie to wherever the safest place we can see is. Granted, I don't see anything particularly notable, but... she only needs to be safe for however long it takes for Dark Matter to get here. Maybe there's a random walkway or something out of immediate reach that we haven't noticed yet?
For dealing with the humanoid and Pokemon shapes coming in... depends so much on what's specifically going on here. If Xerneas is using her life energy to reanimate them though, it's maybe possible that we can try reaching out to Yveltal, and seeing if he can absorb that energy? I'm doubtful that will work, but... yeah. We might not be getting out of this one unscathed.
idk if we also need to give Weavile a pep talk to convince him to let us defend ourselves
Yeah, that might be necessary. His loyalty is definitely something else, to not be shaken by that creepy decayed jumpscare we got just now!
Real pity that we just sent our flying expert and her literal airplane packing.
Yeah, that backfired spectacularly quickly