As a Pokémon expert, I can tell you that Smeargle, the artist Pokémon, has a unique ability in the Pokémon games. It can use a move called
Sketch, which allows it to permanently copy the move of one of the opponent's Pokémon during battle, provided that Smeargle has not used Sketch before and the move is not Chatter, Soak, or a move that Smeargle already knows.
In the context of the games, Smeargle can
learn Sketch only once. Once it has used Sketch to copy a move, it cannot use it again to copy another move until it has been reset by using the move
Snarl, which is exclusive to Smeargle, or by using a move deleter item like
Nugget or
Heart Scale.
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