Mega Klefki
Typing: Steel/Fairy ----> Steel/Fairy
Abilities: Prankster/Magician ----> Hubris (Special-based clone of Moxie)
BST: 57/80/91/80/87/75 ----> 57/80/126/110/122/85
New Moves: Dark Pulse
Klefki is annoying enough without a mega, so of course I'm going to turn it offensive. Hubris is one of the few abilities that seems to fit on most pokes, and thus Mega Klefki gets it instead of a custom move. It has all-around decent defenses as well as an usable Sp.Atk, with Hubris to boost it with each KO. Dark Pulse is there to provide further coverage, and Mega Klefki can also use Calm Mind to make itself even harder to kill as well as more powerful.
Mega Trevenant
Typing: Ghost/Grass ----> Ghost/Grass
Abilities: Natural Cure/Frisk/Harvest ----> Intimidate
BST: 85/110/76/65/82/56 ----> 85/145/101/75/132/36
New Moves: Drain Punch, Work Up
If a ghost tree isn't intimidating enough, I don't know what is. Mega Trevenant is even more of a tank, having great 85/101/132 bulk, as well as both Horn Leech and Drain Punch for some recovery. With a few Work Ups it can easily tank hits and gain back most of its health with either of these two moves. However, it's weak to the common Flying- and Fire-types, and is incredibly slow as well.
Mega Meowstic
Typing: Psychic ----> Psychic
Abilities: Keen Eye/Infiltrator/Prankster(M)/Competitive(F) ----> Trickster (Stat-lowering debuff moves (as in, not counting the likes of Superpower's self-debuff or Aurora Beam's debuff chance) have their effect doubled.)(M)/Technician(F)
BST: 74/48/76/83/81/104 ----> 74/48/101/125/96/122
New Moves: Omnious Wind(F), Draining Kiss(F), Scary Face(M), Fake Tears(M), Baby-Doll Eyes(M)
While Mega Meowstic F can abuse triggering Competitive then Mega Evolving to take advantage of Technician, Mega Meowstic M can use Trickster-boosted debuffs with the priority of Prankster on the turn it Mega Evolves. The stats are set so while they can tank some hits, they can also have enough offensive presence. Omnious Wind gives Mega Meowstic F coverage, while Draining Kiss provides recovery; Mega Meowstic M on the other hand gains Scary Face, Fake Tears and Baby-Doll Eyes, all of which are moves buffed by Trickster.
Typing: Steel/Fairy ----> Steel/Fairy
Abilities: Prankster/Magician ----> Hubris (Special-based clone of Moxie)
BST: 57/80/91/80/87/75 ----> 57/80/126/110/122/85
New Moves: Dark Pulse
Klefki is annoying enough without a mega, so of course I'm going to turn it offensive. Hubris is one of the few abilities that seems to fit on most pokes, and thus Mega Klefki gets it instead of a custom move. It has all-around decent defenses as well as an usable Sp.Atk, with Hubris to boost it with each KO. Dark Pulse is there to provide further coverage, and Mega Klefki can also use Calm Mind to make itself even harder to kill as well as more powerful.
Mega Trevenant
Typing: Ghost/Grass ----> Ghost/Grass
Abilities: Natural Cure/Frisk/Harvest ----> Intimidate
BST: 85/110/76/65/82/56 ----> 85/145/101/75/132/36
New Moves: Drain Punch, Work Up
If a ghost tree isn't intimidating enough, I don't know what is. Mega Trevenant is even more of a tank, having great 85/101/132 bulk, as well as both Horn Leech and Drain Punch for some recovery. With a few Work Ups it can easily tank hits and gain back most of its health with either of these two moves. However, it's weak to the common Flying- and Fire-types, and is incredibly slow as well.
Mega Meowstic
Typing: Psychic ----> Psychic
Abilities: Keen Eye/Infiltrator/Prankster(M)/Competitive(F) ----> Trickster (Stat-lowering debuff moves (as in, not counting the likes of Superpower's self-debuff or Aurora Beam's debuff chance) have their effect doubled.)(M)/Technician(F)
BST: 74/48/76/83/81/104 ----> 74/48/101/125/96/122
New Moves: Omnious Wind(F), Draining Kiss(F), Scary Face(M), Fake Tears(M), Baby-Doll Eyes(M)
While Mega Meowstic F can abuse triggering Competitive then Mega Evolving to take advantage of Technician, Mega Meowstic M can use Trickster-boosted debuffs with the priority of Prankster on the turn it Mega Evolves. The stats are set so while they can tank some hits, they can also have enough offensive presence. Omnious Wind gives Mega Meowstic F coverage, while Draining Kiss provides recovery; Mega Meowstic M on the other hand gains Scary Face, Fake Tears and Baby-Doll Eyes, all of which are moves buffed by Trickster.