In the Anime Team Rocket's moto (theme song) James said "To unite all Peoples with in our
Nation". Why is it said "Peoples" instead of "People" ?
It's a dubbing error. http://bmgf.bulbagarden.net/f228/worst-error-pok%C3%A9mon-anime-94252/ http://bulbapedia.bulbagarden.net/wiki/Anime_move_errors http://pokemondb.net/pokebase/meta/5004/anime-faq-for-anyone-who-wants-it
It happens.
>the human beings of a particular nation or community or ethnic group
James is most likely referring to the people in the Pokemon world.
Source