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The official deletion of Spiky-Eared Pikachu sets a worrisome precedent that Gamefreak can literally just retcon entire pokémon species out of existence if they feel like it.
Believe me, this will not be the last species that Gamefreak retcons out of existence. It happened to one of the most popular pokémon ever, it will happen to random pokémon species.
When Gamefreak inevitably declares your favorite pokémon retconned out of existence, know only that you could have stopped this.