When you lose a match in Tennis, Baseball, or Boxing, immediately press Home before the game displays "You lose". Then, exit to the Wii menu. If timed correctly, when you reenter the game your skill level in that sport will not have decreased.
You have the option of taking a fitness test which includes stamina, power, and speed. Because of the default settings, you can only take the test once a day and must wait until the next day before retaking it. Use the following trick to take the test as many times as desired a day. Go into the Wii system settings and select the calendar option. Then, just move the date up by one day. The game will think a day has passed and allow you to retake the test.
While pitching, press 2 before throwing. To return to a normal delivery, press 1.
While pitching, hold A for a screw ball, hold B for a curve ball, or hold A + B for a splitter.
While pitching, flick your wrist as if you were throwing a curveball and you will throw a hard fastball.
If the person who is batting is on the right, hold A when you throw the ball and it will be harder for them to hit because it spins in the other direction. If the batter is on the left, hold B when you throw the ball. If you hold A + B it slows down just when it is about to get to them.
While batting, as you hit the ball go in an upwards motion (up a few degrees when the ball is hit). You will be more likely to hit a homerun.
To get a gold medal, hit a homerun with all ten balls pitched to you.
While pitching, flick your wrist to get a perfect throw.
When aiming for the pins in the first aiming thing, move all the way to the far right or left. Then, depending on which direction you aimed the first one, aim the second one as far as you can go in the same direction and your target will be in another lane.
When starting a game of Bowling, hold the D-pad in one of the following directions to change the color of your bowling ball. Press Up for blue (default color), Left for pink/red, Down for green, or Right for gold.
Achieve the Pro level to unlock a bowling ball with diamond designs.
When on the "final lane" of Power Throws, move all the way to the right (or left, depending on which hand you use). Turn toward the wall two to four notches then release the ball on top of the wall. If done correctly, the bowling ball will travel down the top of the wall past the pins, and all 92 pins will fall down at once.
As you bowl, hold B. Do not release B, and it will leave the Mii's hand in the air. Do not roll it immediately. Once that happens, you will have your hand in the air with the ball. Then, bowl it as usual after your hand is in the air. You will drop the ball and it will roll perfectly straight quickly.
While holding the Wii-mote up and behind (as if you are getting ready to release the ball), hold B for about three seconds. Release the ball when it reaches slightly past your leg and your Mii character is at the line. He or she will probably take about three steps. You should usually knock down most or all of the pins.
Go to the third dot to your right (or left depending on which way you bowl). Throw it hard to get a strike most of the time.
Line up your character so they are pointing at the space between the #1 and #2 pins (press D-pad Up). While swinging through, do not release B. Instead, hold it through the top of your swing then pull it back again and swing through again. Do this as fast as possible. Upon completion of your second swing, make sure to release the ball with little to no spin. You should get a strike most of the time.
Go to the left of the lane (gutter). Switch to the mode where you can turn from left and right. Point to around the middle of the lane, then roll the ball. You should get a strike. This may require several attempts.
Knock down the pins with a single throw. Twist your wrist to curve the ball. If you knock down all the pins on seventeen lanes you will earn a gold medal.
Knock down the pins with a single throw. Twist your wrist to curve the ball. If you knock down all the pins on all twenty lanes you will earn a platinum medal.
At the 91 pin stage in Training mode, press A, then press the D-pad Right two times. Press A again and move all the way to the right until you reach the barrier. Swing the ball up onto the barrier. Make sure it does not fall off . If the ball goes off the barrier it will not work. If done correctly, you will hear a sound of a rock that is falling. All the pins will fall down. Note: This may require a few attempts.
Move all the way to one side and then press A to switch your angle. Change your angle so that your ball will be aimed in the direction of someone else's lane. Then, release the ball near the top of your delivery to get it to "jump" over the gutter. The ball should end up in another lane.
When beginning your throw, release the ball while you are on the backswing to toss the ball backwards and scare the spectators.
Defeat the Grand Champion, Matt, in a boxing match to unlock the silver gloves. To use them, hold 1 when the screen becomes black before a boxing match.
After your skill level gets into the 600's, your opponents will start to throw more punches at you. Keep dodging to the side. This will make you hard to hit. Whenever your opponent punches and it goes into slow motion, punch at their face one or two times. This will do more damage than normal hits and will help you defeat them faster.
When making a choice at the course selection screen, hold 2. The power meter, map, and wind speed indicator will no longer appear.
While on the green, press 1. You can see a detailed view of the green from where the level of the green changes.
At the third hole on the Beginner course, look on the map and you will notice a small island that is far off on the left side of the fairway. Hit the ball there and you will have a perfect shot at the green.
When starting a game of Tennis (or immediately after choosing "Start Over" on the "Position Select" screen), hold 2 and the tennis court will become blue.
When you are serving, just when the ball is at the highest point quickly flick your wrist. You will see white smoke from the ball and it will be difficult to hit. Note: This may require some practice.
When serving, hold your arm in the air above your head so that the Wii-mote is pointing upwards. Hold B and move your arm downwards. Do not move your arm too quickly or slowly. The ball should travel very fast and there will be a white glow coming from it. Note: This may require some practice.
Before the screen where the game randomly selects the opponents ends, select the black silhouette of the characters to control both sides. Note: The game will have a split screen.
When your opponent hits the ball on either side that will be an out, flick your wrist. Your Mii will jump for it and end up where the fans are.
In Target Practice, intentionally miss the target to hit the brick wall. The section of the wall you hit will darken slightly. Keep hitting it until the bricks begin to break. After breaking enough bricks, a large hole will form. When your ball goes through the hole, your training will end.
Instead of throwing the ball in the normal way by A or jiggling the Wii-mote, flip the Wii-mote in the air and catch it. This requires some practice. Your character will hit the ball all by his or herself. This does not always happen, but with practice you can do this every time you hit the ball. Note: This has no practical use in the game and is only for the purpose of showing off.