Rules
When you first start Pokemon Dash, there will be only one set of rules you can play by. But as you unlock more cups and such, you will unlock a new set of rules. The two different sets of rules are Regular Rules, which are your starting rules, and Expert Rules, which you unlock later on.Regular Rules: For this set of rules you have to go to the checkpoints in a specific order.
Expert Rules: For this set of rules you can cross the checkpoints in any order.