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The only thing that can "devalue" a shinny is yourself honestly. In all honesty no matter how you get that shinny the novelty will eventually wear off. It'll just become that alternate colour palette with a bit of sparkle to it.
What doesn't go away though is how emotionally involved you were in getting that shinny. Maybe you were just lucky or maybe you breed an army of charmanders in the process.
So yeah in a way the only thing that can ruin a shinny for yourself is you.