Sharpedo

Sharpedo defines the term "glass cannon". Its defense stat doesn’t even break 3 digits! This alone kills whatever utility Sharpedo may have had. Don't spend your Stardust here, as not even its Mega forme can save it.

Best PvE Offensive Moveset

• Waterfall should be paired with Hydro Pump for taking on Ground, Fire, and Rock-type Pokemon. This is Sharpedo’s most useful moveset.

• Bite should be paired with Crunch for countering Psychic and Ghost-type Pokemon.

• Poison Fang has no use on an offensive Sharpedo.

Best PvE Defensive Moveset

• Waterfall is clearly superior to Bite, having a significantly higher base damage.

• Crunch is slightly better than Poison Fang on defense, having better damage and coverage at the expense of a later damage window.

• Hydro Pump will pack a surprise, but with Sharpedo’s non-existent bulk it will never get the chance to fire.  

Waterfall’s relatively low energy gain mixed with Sharpedo’s incredibly low bulk means you’re not likely to be firing off Hydro Pumps . As such, Crunch and Poison Fang are the two cheap charged moves of choice. Bite is potentially a usable option, but it's inferior most of the time.