And this time, no more fucking around.
Lets make these pokemon into pokeMEN.
What i got so far:

Mega Gastrodon:
Water/Ground
Sap Sipper for East Sea/Liquid Ooze for West Sea
+Def +SpDef -Speed

Mega Beedrill
Bug/Poison
Disintegrate (Normal moves are now Poison)
+Atk +Spe

Mega Butterfree
Bug/Fairy
Wonder Scale
+SpAtk +Spe

Mega Machamp
Fighting
Abillity: Quadceps (All attacking moves made by Megachamp hit four times, but their base power is now quartered)
+Atk +Def +SpDef -Spe

Mega Clefable
Fairy/Psychic
Abillity: Fairy Flush (Magic Guard, Magic Bounce combined + removes all entry hazards on field when switched in)
+Def +SpDef

Mega Haxorus
Dragon/Steel
Abillity: Dishonored (Each fainted pokemon on Haxorus's team will boost Hax's attack for rest of battle)
+Atk +Def +Spdef

Mega Electrode
Electric/Steel
Abillity: Half-Life
When Electrode faints, it is instantly revived with half of its HP left at the end of the turn (once per battle, can be activated with explosion/selfdestruct)
+SpA +Def +Spe

Mega Arceus
Normal
Abillity: Protean
+20 in all stats except HP
(Judgement in Mega Form now changes type with Arceus so it deals super effective damage, and if the oponnent's pokemon has a 4X weakness, it will change into that type.)

Mega Cacturne
Grass/Dark
Abillity: Border Break (Protect,Detect,Subsitute,Reflect,Light Screen, and all self-def boosting moves made by the oponnent will fail.)
+Atk +Spe -SpA

Mega Golurk:
Steel/Ghost
Sixth Sense (Golurk's moves never miss, and doubles as Mold Breaker)
+Atk +Def -Spe

Mega Alakazam X (current one would be Y)
Ghost/Psychic
Abillity: Corruption (Drains 1/8 of the opponnents health and all health lost is returned to Mega Alakazam X)
+SpA +Def +SpD -Spe