Board Thread:Wiki Discussions/@comment-173.18.234.62-20130413161342/@comment-3448772-20130413161636

Well he is pretty singular in his being. There are no other pokemon like him, as he was an expiriment, like Mewtwo. So he is legendary due to his singualrity, like Mewtwo. It is also likely in part due to his origins, which are currently unknown.