Sceptile with electrify? Is that because of mega sceptile having lightningrod? Never make a sceptile a special attacker. that is a disgrace to their magnificence!Blastoise with Shell Smash and Origin Pulse (It is indeed affected by Mega Launcher). Imagine mega Blastoise with +2 special attack and speed with a 220 base power move.
Sceptile with Electrify
Whimsicott with Spore
Xerneas with Light of Ruin. Imagine that with Fairy Aura backing it up.
Tyranitar with Sucker Punch.
Greninja/Ferrothorn with Rapid Spin
Greninja already has so much going for it if it gets rapid spin then it would outclass almost every other spinner since it also can't be spin blocked because of protean dark pulse. I put Greninja here because before Xy came out there was a rumor it could learn rapid spin for some reason. Ferrothorn already switches in easily, withstands many attacks and has 2 entry hazards. Giving it rapid spin would also make other spinners like Foretress obsolete.
Actually i'm not sure that would be too broken. Given Shedinja's 1HP deal. Even if Sheddy was Ghost/Dark pre-Fairy it would still be susceptible to (and therefore faint from) weather, entry hazard, Poison, Leech Seed, Burn & confusion damage, as well as some items via Trick or Switcheroo, and ability changes via Skill Swap, mummmy etc.Shedinja with Conversion, Conversion2 or Camouflage.