>>47864739>https://twitter.com/ikiro_pkmn/status/1149846544117465089I mention it every time they're brought up, they're used in kaiju encyclopedia (or zukan, the word for the pokedex, which is inspired by those) as a point of reference to tell you how powerful a kaiju is. Gastly's original (and FireRed) entry references an Indian elephant too which is why its in this pic and not the pikachu one. Here's a rough translation.
Of course, in Ultraman this isn't an issue as the settings are usually our world+paranormal.