I'm not quite sure if this was posted already or is old news but I just stumbled across this.

I just finished the Games and after a while, I decided to travel through all the routes and city again and noticed that not even one Pokemon that I have encountered resembles the form of the geoglyphs in Turffield.

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So I started looking online if any of the Gigantamax Pokemon fit and then I saw that Gigantamax Toxtricity has the exact same shape of the tail at the end.

The Gigantamax form of Toxtricity is not in the game to this date but could possibly be an Event of some sort.

Toxtricity also played a role in Hulbury (the statues) - They protected the lighthouse.

Note that Turffield and Hulbury are exactly opposite to each other on the world map.

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https://imgur.com/a/yJ5hbfP

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Source:

Gigadynamax Toxtricity: https://www.serebii.net/pokedex-swsh/toxtricity/

and in Game Footage