Why won't my Galar Yamask evolve?

Question

I keep leveling it up in the dusty bowl area of the wild area, but it just won't evolve. HELP PLEASE.

Comments

https://www.polygon.com/pokemon-sword-shield-guide/2019/11/19/20973054/how-to-evolve-galarian-yamask-runerigus

Answer 1

You need to have it take at least 49 damage points first. Then, WITHOUT HEALING, go to an arch in the Dusty Bowl, pass under it, and the Yamask should evolve.

Comments

It should be noted that if Yamask has more than 100 max HP, then it needs to have less than 51 remaining.

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Sounds like some pretty vital information that should be added to Yamask's page... Also what arch? Whatever i'm doing, it's not working...

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Its the 3 rocks that very very slightly resemble Stonehenge