What is the rarity of each of the various sizes of Pokemon in Legends: Z-A?

Question

What is the probability of a wild non-Alpha Pokemon being XS, S, M, L, or XL? This information is useful for optimizing competitive sets as the sizes are relevant in battle.

Comments

While I'm not entirely sure about how sizes work defensively or their distributions, I know that AoE attacks are larger if the user is larger as well

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https://www.reddit.com/r/stunfisk/comments/1oh2d4b/za_pokemon_size_and_hitboxes_research_and_other/
This thread is very interesting for how size impacts in battle mechanics.

Answer 1

Credit to Anubis for this data.