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There is no species-specific height/weight calculation for SWSH. Height and weight do not necessarily need to be correlated either; any height and weight combination for a given species can be generated by some specific case of the RNG. There are tall/thin Lopunny, tall/fat Lopunny, short/thin Lopunny, and short/fat Lopunny. Height and weight are triangularly distributed, which means middle values are more common than extremely small or large values. PKHeX only enforces height and weight for a few SWSH cases like overworld encounters (fishing, grass, overworld legends) and HOME events that are forced to have 0 height and weight. You can pretty much put any values for most encounters otherwise. PoGO encounters do have some correlation between height and weight that is not well described and not at all enforced. (Light mons tend to be short mons and heavy mons tend to be tall mons.)