All power-ups
While playing a game, press X, A(2), X, Y, L, B, R, L.
Banquet
Goto the main lemur that is on the drum where all the food lies. Talk to him 10 times in a row to earn food. This can only be done 2 times.
Easy coins
Get 30 coins, then go to the Zoovenir Shop. Buy the Coin Magnet, which will make nearby coins come to you. In level 3 as Gloria (the hippo), hit thirty cars to get 15 coins. Note: this only works once.
Flying Bird Mini-game
When you are in level 3, go into the right subway entrance to find one of the arcade games.
Police
When taking on the police you can use the statues, manholes, cages, and carts.
Unlimited Items and bits
This trick requires your main Digimon as player one and any Digimon as player two. Give all your Bits to player two. Then, save player two at the Save Keeper. Next, have player two give all Bits to player one. After that, have player two quit
the game at the Save Keeper, but this time without saving. Then, go to Call Keeper and have player two join in again with the same Digimon. Repeat this from the beginning until you have 9,999,999 bits, both in the bank and pocket. You can
also use this trick to duplicate items. This is very useful if you want to give some rare weapons and armor to a friend.