Pokémon Sun and Moon - Pokemon Size chart: Ultra Beasts 3

Well it is based off bamboo. Besides, if you look at the weight in the Japanese version, it's 999.9kg indicating the dex has reached it's limit. Not something that translates well into olde tyme measurements.

Gamefreak needs to consult some high school physics. A small car weighs about 2000lb and there's no way a 30 foot steel tower weigh as much, unless she's extremely hollow.