Sharpedo is a torpedo-shaped shark Pokémon covered with tiny, sharp denticles. It has a large mouth filled with triangular, sharp teeth. Its eyes are a deep red color and glow in the dark. It has two gill slits situated directly behind each eye. It is mostly dark blue with a white underbelly. There is a yellow star-shaped marking on its snout, and another star marking on its rear. It has a tall dorsal fin with two notches cut into it, with a pelvic fin directly opposite it. Its two pectoral fins are arranged so that they resemble the fins on the back of a torpedo.
As Mega Sharpedo, the fangs in its mouth have transformed, and the horns that have sprouted from its nose are fangs that can be regrown countless times. The yellow patterns on its body are old resurfaced scars that were carved in battle, causing it sharp pain and suffering. With explosive propulsion, it can exceed 125mph in an instant.
Sharpedo swallows and shoots out jets of seawater from its rear, which allows it to swim 75 to 80 miles per hour. However, it is unable to swim long distances. It is feared and known as Bully of the Sea, or Gangs of the Sea as a group, due to its sharp teeth. It was once prized for its dorsal fin as a food item, and has been a victim of overfishing. Its fangs can rip through iron and steel, being able to tear apart a supertanker into pieces. When its fangs fall out, they grow back immediately. It is very sensitive to the scent of blood. It lives in the sea. Sharpedo is known to prey on Wailmer, particularly small ones.
A pod of Sharpedo appeared in Sharpedo Attack!. They attacked Ash and his friends, plus Mr. Briney, while they were at an uncharted, crescent-shaped island. They gained the pod's trust when Brock healed their leader's injury, which had been inflicted when it came across Team Rocket.
Multiple Sharpedo appeared in PK13, where they were attacking Pikachu and the others to across the deserted island, where an Aggron tied up an Azumarill.
In Pokémon Omega Ruby and Alpha Sapphire, if a player surfs on a Sharpedo, it will have its own model, and it can surf significantly faster than other Pokémon. However, it is impossible to fish while surfing on a Sharpedo, the game stating that "It's too risky to let go now!" An NPC on Route 124 refers to this as "speed surfing" if the player admits ignorance to her question.
Sharpedo shares its category name with Hydreigon. They are both known as the Brutal Pokémon.
In a demo version of Ruby and Sapphire shown at Pokémon Festa 2002 in Japan, players started with a level 12 Sharpedo with no Ability. This was most likely done for the purpose of the demo only.
Sharpedo's evolutionary line can be seen as a parallel to Camerupt's family. Both of them are dual-type Pokémon, both lines have identical base stat totals per evolutionary stage, both of their final evolutions are used by Team Aqua Leader Archie and Team Magma Leader Maxie, respectively, and both of their final evolutions can Mega Evolve.
Sharpedo's Pokédex entry for Moon states "It has a sad history. In the past, its dorsal fin was a treasured foodstuff, so this Pokémon became a victim of overfishing." This is likely a reference to shark finning in the real world, where wild sharks are caught, have their fins cut off, and the still alive shark is thrown back in the water to die. Because of the practice, many species of sharks around the world are listed as threatened or endangered by the IUCN.
Sharpedo is based on a shark with the body of a torpedo. It also looks like a shark that has been cut in half. Its general body shape is also similar to an ocean sunfish. Both fish are known for their sandpaper-like skin. Mega Sharpedo seems to also be based on a sawshark or sawfish.
Sharpedo is a combination of shark and torpedo. It may also involve sharp, referring to its fins and Rough Skin Ability.
Samehader may be a combination of 鮫 same (shark) and 肌荒れ hada-are (rough skin). It may also be a corruption of 鮫肌 samehada (rough skin), referring to its Ability.