I'm not sure of specific 'Ash Ketchum vampire fanfiction' titles off the top of my head. However, when looking for such stories, look for ones with high ratings and lots of reviews. These are usually the better - written ones. Maybe there could be a story where Ash is bitten by a vampire - like Pokemon and has to deal with his thirst while still trying to be a Pokemon master.
Well, you can try searching on popular fanfiction platforms like FanFiction.net or Archive of Our Own. Just type in 'Ash Ketchum vampire' in their search bars, and you'll likely find a bunch of stories. Some might be about Ash turning into a vampire and how he copes with his new powers and the challenges it brings in the Pokemon world.
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