Analysis work Mega-Sharpedo

TeamMates

Talonflame can be used to revenge kill keldeo, Lopunny-Mega, breloom and conkeldurr

Klefki is very useful since he can setup spikes which allows at Mega-Sharpedo to 2hko after 3 spikes Alomomola, Mega-Venusaur, Ferrothorn, Mega-Scizor, Breloom (On a switch for check an attack) and Thunder Wave can be used for paralysed and revenge kill some pokemon scarf or faster than Mega Sharpedo after that you have mega evolve like Keldeo, Lati@s, Mega Charizard Y, etc

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Other Option

Ice Fang or Ice Beam can hit pokemons with double weakness typings like Landorus-therian, Dragonite, Gliscor

Waterfall allows at Mega sharpedo to hit harder Gliscor Sp Def

Zen Headbutt can be used for hit Keldeo, Lopunny-Mega and Breloom

Poison fang can threaten bulkier builds mainly wearing down Chesnaught , you can also get the 2hko on Mega Altaria and Azumarill

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Check & Counter

**Bulky Grass Type**: Bulky Grass-types can usually take on Sharpedo attacks easily Mega Venusaur (can Synthesis and Giga Drain), Ferrothorn (can totally wall it and possibly set up entry hazards on it) and Breloom (ohko whit mach punch) are bulky enough for take 2 Crunch attacks.

**Bulky Water Type**: Bulky Water-types such as Empoleon (resiste all Sharpedo's attacks and and has immunity to the poison) Gyarados-Mega and Alomomola are the absolute best way of stopping Sharpedo. Keldeo can check it aswell if it lacks Zen Headbutt

**Steel Type**: Sharpedo is bothered by Scizor/-Mega which can setup with Swords Dance and Roost on him, Ferrothorn and Skarmory ( if you haven't Hydro Pump) they are excellent counters, as they can take any hit from Sharpedo and possibly set up entry hazards on it