Shanatae Backround- Set the clock one minute before midnight. Touch the Ping Pals logo at exactly midnight (00:00) to unlock the Shanatae backround in the shop for 4000 coins.
Miss Month items- Set the DS to the first of any month (the year doesn't matter). When you go to the shop they will be in the outfit section.
Mr Month- Same as Miss, but set the date to the 15th
Watch the credits until they end, then wait until they finish again to get 50 Coins.
Always pick "7". The game usually chooses a high number, and the worst you can lose is 5 Coins if it selects "1".
Enter into Hi-low and resume your game as normal. Remember that 7 or 8 are picked most often. If you do lose though quit the game quickly before the guy takes ur coins. Voila! Free from the rules! Now all that is possible... is winning!
You can change the system date on the DS to a different time or date in order to get new items in the shop. This works well for going back to a date that you missed, or forward to a date that you cannot wait for.
Touch the Ping Pals logo exactly at midnight (00:00:00) when the chime sounds to unlock Shantae's background in the Backgrounds section of the Items Shop.
TIP: Try setting the system clock fifteen seconds before midnight to give you enough time to prepare to do this.
After cycling through the full credits, if you completely cycle through them again you will hear the "coin noise" and will be rewarded with 50 coins. This can be done multiple times. (I don't believe there is a cap)
If you are on Ping Pals on your birthday, go to the shop and there should be a birthday hat for only 5 coins and if you get it for boy and girl its only 10 coins + it dissapears from the shop when your birthday is over.
If you are playing Hi-Lo, always pick 5. If Snakey says the number was 10, hurry up and quit the game. If you aren't fast enough, you only lose 2 coins.
You will need more than one person to do this glitch. If you or your friend that doesn't like their clothes and needs money, Than listen carefully. You buy your friends clothes to give them money. Then, you exit the game, WARNING! DO NOT SAVE! Don't save and turn off the Ds. When you go back on the game, your will have your money back and your friend have the money too!
NOTE, once you've done this, you will never see the clothes again!
When you lose in Hi-Lo (get more than 4 off), if you quit the game, by going to the shop, starting a new minigame, or saving and quitting, before Snakey takes away your coins, you won't lose the coins you would have lost.