Pokemon size variation and giant pokemon

Maximum known general pokemon size multiplier
v1, 2025-03-20

Pokemon Go, split into three categories, small, medium, large
small = 1.55x
medium = 1.75x
large = 2.05x

Mons are assigned to categories arbitrarily.
I believe there's a general rule that larger mons tend to be in the small category.

there may be examples of individuals that are larger than these (I know of a pidgeot that is 1.58x for instance)

These are general - they don't depend on any gimmick.

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Scarlet/Violet uses a different system that I don't know much about, but has size ranges smaller than the ones above so I wouldn't worry about it.

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SV Titans are ~5x or so?

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alpha pokemon from PLA are hard-coded by species:
https://pastebin.com/2cm8Htx6

Dmax is always 16x I think?

The LGPE max size is 1.4x

totem pokemon from SUMO are hard-coded by species.