Pitcher refresh
Once your pitcher gets tired he will lose some speed off of his pitches. When he tires, call a time out and substitute him out. Then call time again and replace the new pitcher with the original pitcher. He will have regained all of his energy and his pitches will be at full speed.
Secret Team
Press and hold the A button and then press Reset. While the intro cutscene is scrolling and before title screen appears, press Up, Up, Down, Down, Left, Right, Left, Right, B and A. If done right, the first player's default home place will be Touzainanboku and the team name will be Kuoshien Koukou. Note: This applies only to the Japanese version.
Pitcher refresh...