It's from the first generation of Pokemon. The egg mechanic came with the second generation.
The first generation even mentions South America, real world references weren't a thing in later generations either.
It make sense when you admit that pokemon is a post-apocalyptic universe
The world was build on the ashes of our and a few references still exist
These bioengeenered monsters probably ended the wars and are now roaming arround but we still remember what was a mouse and some nerd ad the line in the pokedex to make fun of pikachus
Game. It's in the Pokemon Mansion on Cinnabar Island. They found Mew in the South American jungle.
Also Major Surge is called an American IIRC and a war he fought in is alos mentioned.