Ring Tournaments: On the Main Menu, go to the "Special Games" section. Then go to the Ring Tournament Code place. Here are some Ring Tournament codes.

Pokemon.com Cup:V5UFMPU5M
Mr. Pickle's Cup:4YHWOR4Y2
Note: The code given after the Tournament is to rank you on a website among others.

The Unlockables:

Unlock Shy Guy: Win Star Cup in Singles mode with any character.

Unlock Donkey Kong Jr.: Beat the Star Cup in Doubles mode with any character.

Unlock Donkey Kong Court:Beat Mushroom Cup with Donkey Kong in singles mode.

Unlock Yoshi & Baby Mario Court:Beat Mushroom Cup in singles mode with Yoshi.

Unlock Mario & Luigi Court:Beat Mushroom Cup in singles mode with Mario.

Unlock Mario & Luigi Court #2:Win all of the Cups in Doubles with Mario.

Unlock Mario & Luigi's Private Court:Beat Sar Cup in singles and doubles mode with Mario.

Unlock Piranha Plant Court:Hit all 50 balls in the Piranha Plant Challenge Mode on any court.

Unlock Yoshi & Birdo Court:Win the Star Cup as Birdo on doubles mode.

Unlock Wario & Waluigi Court:Win all cups on doubles mode as Wario.

Unlock Super Mario & Wario Courts:Win the Mario mini-games on Mario Tennis for the GBC and send the data to Mario Tennis via Transfer Pak.

Unlock the Star Tournament:Beat the Star Cup as all characters.

Unlock the Special Cups:Beat the Star Cup with evry character, even DK Jr. and Shy Guy, then hold thr R button while selecting your character to get into the a couple more cups.

Unlock Max Difficulty:Win the Planet Cup with all characters to unlock this difficulty in Exhibition Mode.

Play doubles. When your teammate serves the ball. Run up to them and press A or B and you will block it

Power Slice - Tap B, then hold B (blue)

Power Topspin - Tap A, then hold A (yellow)

Power Smash - Hit A or B, followed by tapping either one simultaneously. (pink)

Drop Shot - Press B, then A

Lob Shot - Press A, then B

Powerful Normal Shot - The one I use all the time. Hold A+B and aim where you want. The ball will go toward the back with great power.

on bowser stage grt a mushroom
ard you will go faster if you didnt notice that

Obtaining this cool-looking court is very easy when you know how to do it.

All you have to do is use someone quick that has good cross-court shots. I suggest Yoshi for this.

What you need to do is hit the ball to the opposite side of the court that they are in, and keep doing that when they run to get the last shot. Just keep getting them running from side to side. Also, use the A+B shot or the A shot. They work the best.

In the game there are two hidden chracters you must complete the star cup singles and doubles to get them the two chracters are Shyguy and Donkeykong jnr.

Hold "L" while you are selecting your charcter

Beat the star tournament singles with every character to unlock a max difficulty setting.

Here's a Ring Tournament
5G3LTQ5GN - WimbleDonkey Kong Cup

The Fasters Servers Are:
Bowser
DK
Wario
DK Jr.

The Fasters Players are:
Yoshi
Baby Mario
Birdo

The Trick Players Are:
Boo
Shy Guy
Paratroopa

The All-Around Players are:
Mario
Luigi
Peach
Daisy
Toad
Waluigi

From the main menu, select "Special Games," then select "Ring Tournament." Enter any of the codes below to participate in a secret cup:

Blockbuster Cup-ARM6JQARU
Bowser Cup-N24K8QN2P
Donkey Kong Cup-MM55MQMMJ
Luigi Cup-M1C2YQM1W
Peach Cup-OF9XFQOFR
Mario Cup-A3W5KQA3C
MarioTennis.com Cup-48HWOR482
Nintendo Power Cup-J6M9PQJ6U
Waluigi Cup-LA98JRLAR
Wario Cup-UOUFMPUOM
IGN64-V2UFMPUZM

Each person is different so let me give you the run down.

Technique: These guys are always changing their tactics. Tricky works well against them. They are good against speed.

All around: no strenghs or weaknesses.

Power: these guys are heavy hitters. Use speed against these guys. They are good against tricky.

Speed: Man these guys are every where. Use Technique against these guys. They are good against power.

Tricky: These guys hitweird curb balls. Power is the way to go. They are good against technique.

Win all doubles tournament cups with Birdro.