>>38832367One, try looking shit up before you post. There literally is an underground/underwater train between England and France. It's called the Channel Tunnel (Chunnel for short).
Two, Pokemon's world isn't 1:1 with our world. Kalos and Galar could be connected by land easily.
Would make more sense if they were too since most likely the country that Kalos was at war with back when AZ nuked everything could have been Galar.
