Mega Mewtwo X and Y
Weight - Upper-Midweight
Power - Moderate
Speed - Moderately Fast
Jumping - Standard double jump
Grab - Normal, shorter reach
Special Info - First off it would be Mega Mewtwo X and Mega Mewtwo Y, they could share a slot like Zelda and Sheik.
However, unlike Zelda and Sheik where they have different moves and different stats overall, the Mega Mewtwo's would be much more similar.
The way I see it, Mega Mewtwo X would be better at Melee attacks, since he is part fighting and gets an attack boost. So his standard attacks would be much more powerful than Mega Mewtwo Y's standard melee moves, so aerials and "a" button attacks for example. Also he has steadfast so he would recover from being dazed faster than Mega Mewtwo Y.
Mega Mewtwo Y on the other hand wold be better at special attacks or attacks that use energy, since he gets a special attack boost. So his special/energy moves would be more powerful than Mega Mewtwo X's special/energy moves, so "b" button attacks and throws since he uses energy for example. Also because he has insomnia he would recover from sleep faster than Mega Mewtwo X.
Moveset (final smash, specials, and smash attacks):
Up Smash - Zen Headbutt. Mewtwo does a slight hop and performs a headbutt upward. Causes good damage and knock back if done with Mega Mewtwo X, decent damage and knock back for Mega Mewtwo Y.
Side Smash - Psycho Cut. Mewtwo sings his arm in a fast motion from up to down. Causes good damage and knock back if done with Mega Mewtwo X, decent damage and knock back with Mega Mewtwo Y.
Down Smash - Low Sweep. Mewtwo does a spinning kick move. Hits on both sides. Causes good damage and knock back if done with Mega Mewtwo X, decent damage and knock back for Mega Mewtwo Y.
Special - Shadow Ball: Mewtwo charges up a ball of energy. It then shouts out the ball horizontally. The more it is charged the stronger and bigger the ball becomes. Causes good damage and knock back if done with Mega Mewtwo Y, decent damage and knock back for Mega Mewtwo X.
Side Special - Swift: Mewtwo shoots little stars out of his hand that go about a character length, or two, in front of him. The stars themselves cause little damage and almost no knock back, but they can reflect projectiles. Causes okay damage and very little knock back if done with Mega Mewtwo Y, small damage and minimal knock back for Mega Mewtwo X. Mainly to be used as a reflector.
Down Special - Form Switch: Mewtwo switches forms. Can be used in air, causes no damage.
Up Special - Teleport: Mewtwo quickly vanishes and reappears in a different location, depending on how the user tilts the control stick. Mega Mewtwo X is able to follow up with a melee attack after teleporting, Mega Mewtwo Y can cause some damage to an enemy if they are close to him when he disappears or reappears.
Final Smash (Mega Mewtwo X) - Earthquake: Mewtwo X causes the stage to shake for a while, every enemy on the floor will take damage and be thrown back depending on how much damage they have. If items are on they will be flung around also.
Final Smash (Mega Mewtwo Y) - Blizzard: Mewtwo Y causes a blizzard that covers the whole stage. Enemies slowly take damage from the cold ice/snow and take small damage from falling ice shards. A move more for racking up damage, low knock back unless enemies have really high damage.
Taunt 1 - Mewtwo surrounds himself in a clear ball of energy.
Taunt 2 - Mewtwo spins then thrusts arms upward.
Taunt 3 - Mewtwo shoots out a little ball of fire in front of himself.