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Of all the Pokemon to portray as angry as fuck in most of its anime appearances, its very weird that they went with the literal Barney Pokemon. Even outside of Iris', there was the Pokemon Generations Gen 2 special where Lance's Dragonite went feral on the Team Rocket base, but the design of the Pokemon and its actions don't match so it just looks goofy trying to be taken seriously as a threat on par with something like Gyarados.