A really quick and easy way to get the this is near the start of the game when you save the old couple. First, make sure you DO NOT upgrade fidget or your attack. Now when the first giant appears just use fidget's attack followed by the dust storm flight attack. Use this method, going from left to right, through the giant, then the opposite way. I was able to get over 1200 on the single giant. If this doesn't pop on the giant then you could also try against the two that subsequently appear. Can always reload from nearby save to try again if needed.