Canada's air shot is the Air Snow Storm Shot. When Canada starts the Power Shot, he yells "Snow Storm Shot!" and many large snowflakes appear, all around where Canada is. After that, the ball will start above Canada's head and launch itself at a downward angle towards the ground, much like Brazil's Firebird Shot and Chile's Snake Shot. If the ball hits the opponent, then they will be turned into a snowman that can easily be kicked into the goal, making way for Canada to kick the ball into the goal. One humorous aspect of this shot is when you turn into a snowman, the chorus from the song, "Jingle Bells" plays.
In Canada's ground shot, the ball will shoot straight forwards at the opponent's goal, so it's a low shot that travels in a straight line. The after effect is the same as in his air shot, as well as its accompanying sound effect and the snowflakes beforehand.
Use Italy to unlock Canada, because Italy has a very easy power shot for you and your opponent to counter. Use it as much as you can and expect your opponent to return it to you so you can counter it back again. You can also watch five videos from Canada's Unlock Requirements screen to unlock him.