When playing tennis and building your skill level, you can quickly gain skill points by setting it up so that your Mii is both players on a single side. After orienting yourself to this type of gameplay (it takes some coordination), you will notice that your wins will earn you 40+ skill points each time - basically double what you would have gotten if you had played with the computer on your side.
To do this trick: When you select which type of game to play, "Single Game", "Best of 3", or "Best of 5", it shows you which players are at which locations on the court. Your Mii's default position is the left side server. On the same side, use the A Button and click on the figure standing at the net. It will change from the "?" shadow to your Mii (assuming you are playing alone). Then proceed to pick which duration of tennis you'd like to play.
Note that you should ensure that you win, otherwise you may be at risk to lose double the amount of skill points if you lose.
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