Revise your device to the past or future to take advantage of the following events:
1) catching on sale frogs in the Frogmart
2) receiving daily gifts within short time
3) no waiting time for egg hatching
4) gaining on xp and easy money earning for selling frogs (just need to set the time back, the frog will still be there before sold)
When you win the Race, pick "Take Frog" instead of receiving money, then press as many Frogs as you can at the same time, if you're done it right, they should all arrive in your mailbox.