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Giant Pokémon are Pokémon which are significantly and abnormally larger than the normal size specifications. There have been several occurences of giant Pokémon in the anime.
Examples of Giant Pokémon
Also in the episode Island of the Giant Pokémon some giant Pokémon can be seen such as Pikachu, a Blastoise, etc., although at the end of episode it is revealed that they were mechanical replicas of a theme park.