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What was this Pokémon before it became Houndoom?

Fact Lab

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Interesting fact:

Slowbro is the only Pokémon that can de-evolve. According to its pokédex entry, it will revert back to a Slowpoke if the Shellder on its tail is removed. The evolution of Slowpoke into Slowbro is the only time that evolution by two Pokémon physically merging is shown.