Ash in “Dreams of the Sun and Moon!”

[after thinking about what Olivia said about travelling the world to improve his skills, as well as realizing that his Alola journey is drawing to a close] I've got it! I've decided I want to go out and see the world! [Rotom Dex is confused] Pikachu, what do you say we go home? [Pikachu eagerly jumps onto Ash's shoulder] The world has more awesome things for us to see. There are tons more Pokemon out there! [Pikachu eagerly agrees to head into another new adventure. Keep in mind that because Ash officially won a League and is an official Champion, having Ash compete in more region Leagues after that would have been seen not only as a repetitive and tiresome storyline but also as a permanent regression in Ash's skills as a trainer.]