[Sword & Shield] how do you catch articuno?

Its the only one im having trouble with, i have the other two

Start at the Fly point on the east side hill connecting grass and snow. Chase Articuno far north. Follow it left into a grassy area (rather than right towards the caves).

Quick map:


Advises saving beforehand. Could faint to Hail.

Edit: Must apparently pick the right Articuno at the end location too. Should be able to pick a fight at the Old Cemetery as well.