Sweden's Power Shot is the Viking Shot. When the Power Shot starts, a Viking ship appears and Sweden jumps into the ship. Sweden then says: "Bury." The Viking Ship first fires a few cannon balls at the defender that deals massive damage. Then the ball is shot. It is shot on a cannon ball, but it can either be a high cannon ball or a low cannon ball. This makes his power shot very good because the defender doesn't know whether to jump or not. If the defender manages to hit the ball, then he will get turned to ashes for a few seconds allowing Sweden to take an easy goal, unless the ball rolls in too quickly.
Sweden wears the Spikes Costume with retracting spikes that deal damage on contact with the opponent in Arcade mode. Once he activates his power button he will lose it. This is an SS rank costume and you can pay it for 750,000 points after winning against Cyborg in Survival with this costume.
To counter his shot, one must look at the pattern the cannonballs are fired. If the first cannonball comes from the top, the ball often comes from the bottom. If the first cannonball comes from the bottom, the ball comes often from the top. This is, however, not always right, so be careful.
Another strategy that is less effective to counter attack, but that will make you sure to block his power shot is to wait for a second, then jump. This means you can hit the ball whatever the line it is in.