>>54059711Something interesting to note is that the games essentially treat the Pokemon as sort of "immortal". They always refer to deaths as "if" not "when". Though there are some points where death is mentioned in the game stories, or implied, like with AZ's Floette becoming actually immortal (though again, the context for that was during a war when Pokemon were dying in battle.)
If I had to wager what the literal "canon" based on the text is, is that Pokemon likely only die from severe battle wounds, or extreme old age (hundreds of years).