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Assuming Robbie really is trying to throw a knuckleball then if he can learn how to throw it consistently he could easily dominate hitters at the high school level with it. Knuckleballs spin very little which is way different than other pitches like a fastball that (usually) spin a lot. A good knuckleball has irregular and unpredictable movement. This makes it difficult for the catcher to catch it let alone try to hit it with a bat. It might look like its coming right down the middle but break suddenly in any direction. Just a rough explanation for anyone who might be confused. I recommend looking it up on YouTube to get even more in depth about the pitch and its history.