And let's start! Our current slate is Chesnaught, Greninja, Diggersby, and Talonflame!
Hope you all remember how to do it!
While I'm here, here are my submissions:
Mega Diggersby
Normal/Ground -> Normal/Ground
Pickup/Cheek Pouch/Huge Power -> Huge Power
85/56/77/50/77/78 -> 85/96/97/50/97/98
Don't fix what ain't broke. This submission keeps it simple. Both Mega Mawile and Mega Medicham have about 100 Base Attack with their Double Power antics so I added enough attack to Mega Diggersby to approach it. I then added 20 points to its defenses and speed. Now it might be able to survive some attacks and it can outspeed some stuff. It's not too bad. It's already pretty viable in OU (It's BL right now) so this Mega just patches up some of its rough spots without changing it.
Mega Chesnaught
Grass/Fighting -> Grass/Fighting
Overgrow/Bulletproof -> Bulletproof
88/107/122/74/75/64 -> 88/137/152/74/95/84
Moves: +Superpower
Chesnaught has a GOOD niche in OU right now. It might not be OU but it's certainly usable in it. This tries to add on to its walling powers so it can be OU worthy. I wanted to give it a more powerful fighting move, but to be honest, Close Combat doesn't really make sense with this slow bulky monster. Superpower is definitely good for Chesnaught (though I'd still use Hammer Arm so it doesn't decrease it's main niche). Now it is a better physical wall and it has passable special defense. With Synthesis and Leech Seed, you'll be able to keep it going.
Mega Talonflame
Fire/Flying -> Fire/Flying
Flame Body -> Gale Wings -> Feathery Cushion (Rock Head Clone)
78/81/71/74/69/126 -> 78/121/111/74/109/96
Here's a completely new take for Talonflame. And it's kind of an obvious one considering it gets two recoil moves for STAB. First thing I did was destroy the speed. As my one friend would put it, this Talonflame got fluffy and a lot cuter (as fluffy birds tend to be). To be honest, it lost a bit of power since it can't carry items and it loses a LOT of speed. However, its bulk and its ability really helps it a lot. Instead of being a Choice Band user, Mega Talonflame becomes a Set-Up Sweeper. Remember Bulk Up Talonflame? This set does it MARVOUSLY better with its newly added bulk
Mega Greninja
Water/Dark -> Water/Dark
Torrent/Protean -> Protean
72/95/67/103/71/122 ->72/155/97/103/101/102
Moves: +Ice Punch, +Sucker Punch, +Bullet Punch
Physical Wallbreaker Greninja. To be honest, if you want to make it Protean, you're going to need to reduce the speed to something that won't actually be broken. Protean is what makes Greninja good. I did the Mega Heracross Method of boosts. I gave it +60 attack while decreasing its speed by 20 points. To begin with, this Greninja is a bit of a lure compared to regular Greninja. With now three forms of priority (four if you count Sucker Punch), you can actually make a whole moveset of just priorty. Aside from Sucker Punch, I can't see any real advantages in using physical regular Greninja with these powers, but it's certainly cool as a cucumber with its new moves and new physical power. And it gets a bulk boost so, it can survive something now (Hey, my Greninja survived a +6 Aegislash's Shadow Sneak. Now it can survive it and be able to launch another attack and not kill itself!)
To be honest, Mega Greninja is just my sort of play idea. If you can figure out something better, go for it.