Sorry dude but those aren't open for submissions - discussion... You can only post about the two pokés selected each slate... This time the two victims are Klefki and Whimsicott...
Then... I'm gonna post my things even if I personally feel there are two other submissions that are pretty amazing (one each poké)... Maybe you like them...
Klefki-Mega
Ability: Prankster/Magician -> Prankster
Type: Steel/Fairy -> Steel/Fairy
New Moves: Wish
HP: 57 -> 57 (+0)
Attack: 80 -> 100 (+20)
Defense: 91 -> 111 (+20)
Special Attack: 80 -> 100 (+20)
Special Defense: 87 -> 107 (+20)
Speed: 75 -> 95 (+20)
Not a big deal here... Boosted stats everywhere to make it less passive and a little bit bulkier. Wish will be amazing with priority and will grant Mega Klefki some healing... however this will not be broken because it will still need two turns to work and 57-100-100 isn't absurdly bulky. Of course, Wish - Protect shenanigans can work but then you are giving up two moveslots in your mega just for auto healing... and wish passing from base 57 HP will not be enough for a lot of pokes... at least having priority can help it to wish before fainting to pass a little bit of recovery to another teammate.
Whimsicott-Mega
Ability: Prankster/Infiltrator/Chlorophyll -> Prankster
Typing: Grass / Fairy
Stats:
HP: 60 -> 60 (+0)
Attack: 67 -> 92 (+25)
Defense: 85 -> 100 (+15)
Special Attack: 77 -> 102 (+25)
Special Defense: 75 -> 95 (+20)
Speed: 116 -> 131 (+15)
Stats: 60/127/95/77/105/116
Move Additions: Work Up.
What? what are you doing with this?????
Yep... I'm sure... 92-102-131 are decent attacking stats and prankster will make Whimsicott able to still get the whole prankster thing, but it can also get a Prankster Work Up boost and try to sweep with Moonblast - Giga Drain - Hidden Power coverage. Also 131 speed will put you over a few speedy things to make sweeping possible (and also gets Whimsicott over Talonflame in case you want to paralyze it xD). The added bulk might feel weak but it's enough to still make Whimsicott-Mega pretty annoying with Sub-Seed things thanks to still having the same crappish HP but better defenses (252 Def/252SpD/4SpA Sub-Seeding-Protect will be absurdly annoying to take down, especially considering that anything with more than 261 HP will give you enough HP for infinite subbing (Hell, Blissey will give you more than a sub each turn xD)... so, Why not?
See ya!