>Mega Sceptile
>HP - 70
>ATK - 105
>DEF - 65
>SP. ATK - 135
>SP. DEF - 105
>SPD - 150

If Mega Scep can get a free switch in on Rotom-W's Discharge or Volt Switch
>+1 252 SpA Sceptile Leaf Storm vs. 252 HP / 252+ SpD Assault Vest Rotom-W: 302-356 (99.3 - 117.1%) -- 93.8% chance to OHKO
>+1 252 SpA Sceptile Giga Drain vs. 252 HP / 252+ SpD Assault Vest Rotom-W: 174-206 (57.2 - 67.7%) -- guaranteed 2HKO

>Mega Swampert
>HP - 100
>ATK - 140
>DEF - 120
>SP. ATK - 95
>SP. DEF - 100
>SPD - 80

VS. Ferrothorn (w/ some Entry Hazard Support)
>252+ Atk Swampert Low Kick (100 BP) vs. 252 HP / 252+ Def Ferrothorn: 152-180 (43.1 - 51.1%) -- guaranteed 2HKO after Stealth Rock and 1 layer of Spikes

Also post general hope for Megas, which ones desperately need them and some new moves to complement it, speculate BST for said theory-Megas, etc.