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From a lore perspective (yes, Pokémon does have some semblance of lore), is reclassifying some Pokémon as Fairy a retcon or Pokémon researchers just collectively deciding that these Pokémon didn't fit the type that they were initially categorized as and after being more closely examined, realized they should be considered something else entirely? After all, it's said at the start of every game, anime episode, and anime movie, that Pokémon aren't widely understood and most haven't been discovered yet. Real world zoologists do this often, once they realize their older science didn't fit the model of what was more recently established.
