He didn't ask if mega blast was a good rapid spinner :/ but ether way it is true. Blastoise has a more utility move set then a special sweeper. Even mega blastoise can be used as a utility poke to remove rocks and scald or toxic.....However due to mega Mega Blastoises 135 base special attack, and high def, and special def, he can be used with more special moves then he could before. (Ex-rapid spin, dark pulse, scald, and ice beam or aura sphere would be a good move set)