Now that Pokémon TV has been discontinued, The Pokémon Company has released an infogram listing the streaming services and digital platforms where people can legally watch the English Pokémon dub. Unfortunately, the series is spread out over many different services, making it very difficult on viewers.

Infogram:

Where to Watch Pokémon Episodes & Movies

This guide shows where you can catch exciting episodes from the entirety of Pokémon the Series, as well as epic Pokémon movie adventures and other fun Pokémon animation. Episodes and movies are available via streaming services and via digital rental or purchase.

Source: https://www.pokemon.com/us/animation/where-to-watch-pokemon-episodes-movies