An Analogy of Shiny Stones: Evolution and Pokemon, etc.

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Evolutionary stone

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For the Oval Stone, see evolution-inducing held item. For the Eviolite, see stat-enhancing item.

Gloom's branched evolution family as demonstrated in the anime: both of Gloom's potential evolutions require an evolutionary stone.

An evolutionary stone (Japanese: 進化の石 Evolution stone) is a stone-like item that radiates a mysterious energy that causes some species of Pokémon to evolve.

Another stone, the Everstone, is different in that radiates a type of energy that prevents evolution in the holders; however, if a Pokémon holding the Everstone has an evolutionary stone used on it, it will still evolve.

Evolutionary stones may be used at any time, and cause instant evolution in the Pokémon they are used on, which cannot be canceled. With the exception of the Everstone, which must be held for its effects to take place, all evolutionary stones are applied directly to the Pokémon. All stones that cause evolution in a Pokémon are consumed upon that Pokémon's evolution.

The use of a stone is seen by many to be "forced" evolution, especially by the main characters of the anime, as the Pokémon is not in charge of its own transformation. Many Pokémon that result from a stone-based evolution also have vastly different level-up learnsets than their pre-evolutionary forms, with several learning no moves after evolution at all.