Please let Mega Shiftry be real. Shiftry already has a pretty good movepool, all it's missing is some good stats. No matter what direction they decide to take the Mega in, Shiftry has the moves to at least be decent.
Physical attacker? Swords Dance, Seed Bomb, Knock Off, Sucker Punch, Fake Out, Brick Break, X-Scissor
Special attacker? Nasty Plot, Leaf Storm/Energy Ball, Focus Blast, Shadow Ball, Dark Pulse, Extrasensory
Bulky/Utility? Defog, Leech Seed, Giga Drain, Foul Play, Synthesis, Tailwind, Whirlwind