Pokémon Mewtwo Strikes Back was first film for the franchise and it was a big hit but it seems they had big plans for it. One plan was to use it to kill off Ash. This is coming from the writer who wanted this to be Ash big and last adventure.
“Months and years pass. Ash grows old, then one day suddenly he looks back on his past. He remembers his childhood fondly. The adventures he had with his amazing Pokemon, the friendship, the coexistence. Maybe Ash wasn’t able to experience these things later in life. However, as a kid there was Pikachu and lots of other Pokemon, Jessie and James, and Mewtwo… And so much more — elderly Ash remembers everything that happened during his adventures as a young boy,”
Article:https://comicbook.com/anime/news/pokemon-anime-final-episode-dark-ash-death/
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