WiiRevealed

Unlockables:

Getting pro in either tennis or boxing:
  If you get pro, which is over 1000 points, then in either sport, the reward is a bigger audience, and all of your Miis that aren’t being played get put into the audience. If you make a bunch of random Miis, they will all be there.
 
Special Bowling Ball:
  Get to pro level to unlock a bowling ball with diamond designs on it.

Secrets:

91 Pin Strike in Power Bowling Training:
  To get an automatic 91 pin strike in the last round of Power Bowling, Throw the ball on the right or left rail (depending on if you are right or left handed) so that it stays on it the whole time. If it reaches the end without falling off, you will hear a “click” and an explosion. Then all the pins will fall down from the shock wave. NOTE: This only works on the last round.

Pitch Underhand:
  While pitching, press 2 before throwing. To return to normal pitching press 1.

Having display issues with your Neo Geo VC games? Here’s a quick fix that should have things running fine in no time.

- Start a Neo Geo VC game
- When the screen screws up, hit the home button
- Access the operation guide
- Plug in a Nunchuck and hit A+Z+1
- If done correctly, your Wii will switched to interlace mode (a chime will sound if you do it right)