* Real in the sense of existing in the real world: All Pokemon are fictional creatures created for the Pokemon franchise. So in this sense, none of them are real.
* Real in the sense of being officially recognized by the Pokemon universe: There are some Pokemon that are considered "mythical" or "legendary" in the Pokemon world, meaning they are very rare and often have unique abilities. These Pokemon might not be commonly encountered by trainers, but they are still acknowledged as real within the Pokemon universe. Examples include Mew, Celebi, and Arceus.
* Real in the sense of being created by the developers but not officially part of the games: There have been instances of Pokemon concepts that were developed but never released. These Pokemon might be found in leaks, concept art, or other unofficial sources. While not officially part of the games, they were still created by the developers and could be considered "real" in a way.
So, while there are no Pokemon that exist in the real world, there are Pokemon that are considered "not real" in the sense of being mythical or legendary, or in the sense of being unreleased concepts.