Does the Eevee name trick only work once?

Does the Eevee name trick only work once? To get a specific evolution, you can name your Eevee one of the following names, and it will evolve into the corresponding variant, guaranteed. Note: This naming trick only works once per evolution. If you already used “Sparky” to get a Jolteon, it will not guarantee a Jolteon next time.

To get a specific evolution, you can name your Eevee one of the following names, and it will evolve into the corresponding variant, guaranteed. Note: This naming trick only works once per evolution. If you already used “Sparky” to get a Jolteon, it will not guarantee a Jolteon next time.
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