Another technique is to hit Mew with a Pester Ball while it is chasing the energy shield. It will start spinning in place for a few seconds before disappearing. To keep it from disappearing, keep throwing Pester Balls at it. Do this through the whole level to keep Mew in front of you the entire time.
After the second time Mew flies at you in its energy shield, turn your camera to the left and up slightly. When Mew flies by it immediately does flips. Take a close-up of it in the classic curl position while its whole body is towards you, with the light will behind it. This results in a photograph worth over 8000 points.
It is possible to get a score of 10,000 points on Mew. It also may appear on the right side. If it disappears on the left side hit, it will reappear on that side. If it disappears on the right side, then it will reappear on that site. If it disappears in the middle, the next location will be random.
After breaking Mew's second shield, hit him with an apple. Do not hit him with a Pester Ball because it will not have any effect. This should result in a closer picture.
When you have popped his energy shield, use the Dash Engine to speed up to him. Throw a pester ball at him to get a close-up photograph of Mew that should result in 8500 to 9000 points.