Preliminary thoughts on weight and height of Pokémon(repost from Tumblr)

My current stream consciousness related to the weights and heights of Pokémon:
Overall:
-Very few species do not change their stats upon evolution, and very few of them go backwards.
-Thus, heights and weights reflect the species in-game role, stage and stats.
-Species that are meant to be equivalent of a stage tend to have stats match to that. Tyrantrum, Noivern, Aurorus and Probopass all have stats comparable to a third stage, both in BST, but also in height and weight. Yanma, Munchlax, Tentacool have stats comparable to a second stage, though barely in BST for Tentacool.
-Heights and weights have clearly determined the pre-evolutions and evolutions, as only species that could logically get one of them has gotten them. Porygon-line is an exception, though, since Z is a restated version of 2, and 2 was meant to be a smoother version of OG gon, so its lighter and smaller.
Yes, this also means some of the existing species can totally get evos, prevos etc. but only in theory since post-Eviolite no new stages have been introduced, but new side stages have(Sylveon)
-Similar to above, some species have odd trivia in their height and weight. Honedge’s statistic match real scabbards/executioner swords, and Mega Metagross is roughly heavy as a Metagross with another deformed Metagross strapped on back, which is what Mega Gross essentially is.

Heights:
-Almost all evolutionary lines are the double of their previous stage’s height, give or take 0.2 metres.
-The few that change more drastically also have drastic BST changes. Noibat to Noivern is a good example.
-Height of the Pokémon is dependent on the body style classification it seems. Species that change body styles have odd differences, because their height is calculated differently. Some don’t, however, for example, Lickilicky is tailless in its dex category but its height reflects its tail.
-Similar body types are differentiated if the evolution has horns. Rapidash and Sawsbuck have significant differences due to this.

Weight:
-Weights are completely honorary. They are not meant to be realistic. Instead, they reflect the stats or the value of Pokémon. This is likely because in bug wrestling competitions, Pokémon’s inspiration, heavier bug is almost always objectively better because it cannot be lifted, so their fictional counterparts are also determined by their weight.
-Stone evolutions and Megas do not differentiate from their base forms much.
-Certain generations have odd means of weighing Pokémon, depending on how they consider species. Sinnoh has heaviest base forms for its early game mons, because it is meant to be “the ultimate generation”, so the base forms are the ultimate(read: heaviest) base forms. Kalos and Unova Pokémon are meant to have their bases as mostly infants, so they are light, with Kalosians being lighter than Unovans. Unova and Hoenn have very heavy final species because they were light retcons, which attempted to make their new species significant.
-Third stages change drastically, because they are “the most perfect” forms. Second stages change drastically for Unovan Pokémon because they were meant to be competitively viable with Eviolite, but other generations do not do this, because they were meant to be transitional stages, thus shit. Though Hoenn mid-stages are a bit heavier to reflect the heavier second stages.
-Second stages gain a lot of weight, but not drastically(about double to five times of the original). Most drastic changes occur for odd generation species. Second stage starters have weight equivalent to these species. Pseudos are heavier, mostly(except Sliggoo and Dragonair who are very light to swim on surface of water).
-Later the species obtained the heavier, though mid-game mons tend to be heavier than late-game mons in their base forms for some reason.
-Cute mons are very light. Cinccino and Azumarill are not too different from their pre-evolution, even though Azumarill is a fatass. Cute legends also reflect this.
-Lore matters a lot. Floating and Flying species are very light, with more acrobatic evolutions like Venomoth and Gliscor being lighter than their pre-evolutions. Terrestial species are heavy. Glutton species and defensive species gain a lot of weight in all forms.
-Types matter a lot. Ground, Dragon, Steel, Rock and Ice are the heaviest, Fire, Electric are mediocre, Fairy, Bug and Flying are very light. Skrelp and Seadra gain significant amount of weight after their type change.
-The item hold by the species is reflected. Mega Sableye and Komala get their weight from their items.