Ok, so does size matter in Pokemon Go? Well the short answer is yes it does. But how I hear you ask? Well..... Battle theory So some people speculate that the heavier the Pokemon is the more damage it will do in gym battles! However, others have found that it makes no difference at all. Collectors theory If you click on your avatar and scroll down you will see that their are medals to achieve. If you click on say the magikarp one it will state that you can obtain this medal by catching 3 large magikarp. The third and final theory is the HP theory If you have two Pokemon of the same CP, the heavier one will have a higher HP. Therefore, does this not make it more difficult to take down in battle? Don't believe me? Check out the video below!