Choose the single game option, and when you get to the team selection screen, press left then right on the conrol pad six times. This team consist of the game's developers with super attributes.
Big glove Catch a ball that is going over the fence.
Huge glove Make two diving catches in a single game. Pulsating glove Make three diving catches in a single game. Two homeruns in a row. Big baseball Six strikeouts in a row. Huge baseball Nine strikeouts in a row.