Dayum. I tried face tanking Valk but i got rekt like 3-4 hits, and that's why i wanna try comet then speedpots. lel. I can't even tell when she's gonna use EQ. Maybe it's the long casting but ain't sure.
She EQs towards the very very very end. That's when she goes into power up mode too. You can definitely face tank her with shield. Just like how a gene would, bring ygg berries, seeds and pots. And simply alternate between them, as you tank her.
You can try safety wall too, but that seems like a waste of time to me.
I have never done it on WL but do it regularly on my gene.