Shiny Infernape obviously so good... :o
In all seriousness though, I've noticed several Pokemon that look like they have real potential here. Weavile looks like a monster special attacker with its speed, access to Nasty Plot, and Ice Beam and Dark Pulse STABs, and Alakazam has a surprisingly great physical movepool to work with, including Psycho Cut and the elemental punches, that also get a recoilless Life Orb boost (or you can go Mega for the additional speed).
Rampardos gets Sheer Force to grab a recoilless double-Life Orb boost off a base 165 Special Attack. After a Rock Polish, this thing could wreck!
Dragon Dance Latios (again, go Mega if you prefer it over an item) is now actually a thing to be scared of. You could do it with Latias too if you want more bulk and access to Sucker Punch, though the drop in power is noticeable.
Metagross has potential with a Rock Polish Life Orb set much like Rampardos, with considerably less power but superior bulk and stronger STAB moves. Psychic, Psyshock, Flash Cannon, Shadow Ball, Sludge Bomb, Grass Knot and Hidden Power are all available for it to use too. It could go Mega of course for the extra speed and special bulk, but only Grass Knot gets a Tough Claws boost and the other moves would be better served with a Life Orb than the measly +10 base Special Attack boost the Mega provides.
Oh, and say hello to the beast that is shiny Greninja. Base 103 Attack might not sound like a huge step up, but Greninja is already so dangerous and the extra power allows it to go fully physical, or if you prefer, go for a physically-based mixed set instead of a specially-based one. Waterfall, Water Shuriken, Shadow Sneak, Night Slash, Gunk Shot, Rock Slide, Low Kick, Power-Up Punch, U-Turn, Ice Punch and Bounce are all available for it to use, along with its special movepool and the infamous Spikes.
