This glitch works depending on how powered-up your custom team is. You need a custom team that is earning at least $60,000 per game in league mode.
Go to "make team" on the main options screen and choose "strong pitchers" for your team background. The very last pitcher of the team you just created should have a pitching max of one digit(1-9) or a direction and a digit (e.g. down 1) This means that they can be powered up to 15 points in every attribute.
Contributed By: Llamaman2.
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