>>51406169size variations are confirmed back by leakers, size data is stored throughout a Pokemon's data no matter what game they're in, and if you look in the section with the Male MC running with the Sunflora they're very clearly not all the same height ( It's especially noticeable with the ones near the back left, one is right behind the other but the one in the back is blatantly taller). No reason for them to revert to normal size
