Baseball Superstars 2013 Hints for iPhone/iPad
Also on: Android
These are earned by playing matches against another player's team in the PvP menu. You have five chances per day and you will be rewarded the Upgrade Stone on the 5th win.
EXP and SP are earned by training. When you have accumulated sufficient EXP player levels will increase and the SP you earn can be used to learn skills.
Keep an eye on the shadow of the ball when batting as this will help you accurately judge it's distance from the plate.