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Look op, Pokemon has random elements in it. It's part of the game and you're told that up front. By playing the game, you agree to playing with those elements within the game itself. If you don't like it, you can make your own game, or play checkers, chess, or just straight up Rock Paper Scissors. Those seem like more your speed, especially if Sunkern is giving you problems.
TL;DR - Git Gud