Mention that Hydro Pump is almost as powerful as a 2x effective Ice Beam... So barely more power vs Thundurus.
Also, in Drizzle, (a real reason to try Sharpedo), Hydro Pump becomes a 270 base power move, and scores more KOs. Obviously mention that in Drizzle HP Fire should be replaced by Ice Beam completely, as Ice Beam hits Dragons, and Grass types harder than a resisted Hydro Pump.
Also, Aqua Jet becomes 90 Base Power, and with Speed Boost, barring Extreme Speed or Fake-out, it will always go first vs other offensive Priority moves. This could be a great asset for Sharpedo to avoid Bullet Punches, Sucker Punches, Vacuum Waves, foe Aqua Jets, and Mach Punches while hitting pretty hard off 120 Base attack. 90 Base power is nothing to scoff at, its like using a non-stab Leaf Blade...