>>43669854Some megas make sense as an extension of the original. Kangaskhan's baby gets out of the pouch and can fight now. Gengar continues its journey into the material plane. Slowbro's Shellder gets bigger and eats more of its body. Gardevoir's heart opens up. Gallade wears its heart on its sleeve (literally).
But then there's others where it's just "more". Sharpedo is one of those megas. Mega Sharpedo just adds more of the bits that are on regular Sharpedo. More teeth, more spikes, and more yellow markings.