High Heat Baseball 2004 Cheats (GameCube)

You go to the options menu and go to edit/create player and you put in
  the first and last name and go to all the player stats that are blue
  bars and you can put their hitting speed and other things to full
  which will make them the best and if you do enough players you can put
  them on teams and you can play with them and you will have the best
  team