Shulk has the Monado’s Power at his side, but that won’t be enough to stop Natsu. Even if Shulk knows what Natsu is going to do, he will not be able to dodge the onslaught of attacks. Natsu’s speed is incredible and not even Shulk’s speed mode will end up being a match for it. Natsu may have a tough time trying to break the Monado, but he will be able to take it away from Shulk and end the fight. Natsu wins.