Interesting mechanics information if true. ELs seem pretty simple and transparent (apparently you can get it for mass releasing, also like candy), we see the Home(?) ball, and size is a thing too though I wonder if 0 is smaller than normal or just the base.
The Height value isn't new. It(and weight value) are fully coded into the six other switch Pokemon games, it's just the first one to have any sort of visible difference(though the differences are mentioned in wild encounters and recorded in the pokedex in Let's Go). Pokemon transferred from prior gens always have 0 in both height and weight. Pokemon caught in any of the switch games have completely random height and weight modifers, so it is for example possible to have 0 height but 255 weight and vice-versa