Appearances- Pokémon Green [GB] Pokémon Blue [GB] Pokemon Red [GB] Pokémon Yellow [GBC]

Pokémon Gold [GBC] Pokémon Silver [GBC] Pokémon Crystal [GBC]

Pokémon Sapphire [GBA] Pokémon Ruby [GBA] Pokémon Emerald [GBA]

Pokémon Leaf Green [GBA] Pokémon Fire Red [GBA]

 Pokémon Pinball [GBC] Pokémon Puzzle League [N64] Pokémon Mystery Dungeon - Red Rescue Team [GBA]

Pokémon HeartGold Version [DS] Pokémon SoulSilver Version [DS]

 Pokémon Pearl [DS] Pokémon Platinum [DS] Pokémon Diamond [DS]

Super Smash Bros. for Wii U [WIIU] Super Smash Bros. Melee [GC]

 Pokémon Colosseum [GC] Pokémon XD: Gale of Darkness [GC]

 Pokémon Black [DS] Pokémon Black Version 2 [DS] Pokémon White [DS] Pokémon White Version 2 [DS]

Pokémon X [Nintendo 3DS] Pokémon Y [Nintendo 3DS] Pokémon Alpha Sapphire [Nintendo 3DS] Pokémon Omega Ruby [Nintendo 3DS]

            Pokémon Sun [Nintendo Switch] Pokémon Moon [Nintendo Switch] Pokémon Ultra Sun [Nintendo Switch] Pokémon Ultra Moon [Nintendo Switch]

Pokémon: Let's Go, Pikachu! [Nintendo Switch] Pokémon: Let's Go, Eevee! [Nintendo Switch]

 Pokémon Sword [Nintendo Switch] Pokémon Shield [Nintendo Switch] Pokémon Shining Pearl [Nintendo Switch] Pokémon Brilliant Diamond [Nintendo Switch]

Pokémon Scarlet [Nintendo Switch] Pokémon Violet [Nintendo Switch]

Personality- Mewtwo is stoic and may be moved to violent action when angered or forced to defend itself.

Abilities- Pressure: When a move is attempted against Mewtwo, the foe's Power Points lower by two instead of one.
    (Hidden Ability) Unnerve: An opposing Pokémon will never use their held Berry while Mewtwo is in battle.

Attacks - Confusion / A psychic-type attack. Has a one in ten chance to cause confusion when damaging another Pokémon in battle
       - Swift / A normal-type attack. Does not miss, even when a foe has left the targeting zone using Dig or Fly. Can be blocked with Protect or Detect.
       - Psychic / A psychic-type attack. Low odds of lowering a foe's special or special defense when it strikes.

Status Moves - Disable / The target will be unable to use whichever move it previously used until it wears off.
            - Barrier / increases Mewtwo's defense by two levels.
            - Recover / heals Hit Points by half Mewtwo's maximum health
            - Mist / temporary protection against stat reduction
            - Amnesia / increases special or special defense by two levels

Note: though not comprehensive of all possible abilities, every incarnation of Mewtwo will be able to know the above techniques at minimum.

Weaknesses- Bug, Ghost and Dark typed attacks will be super effective if landed against Mewtwo.

Relationships- Mewtwo is a direct scion of timeless immortal Pokémon Mew.

Backstory- Mew's DNA was harvested from an undisclosed source preserved from an ancient time when it appeared before humans. Mew's DNA was used to incubate an enhanced clone of Mew christened as Mewtwo.

 Fun Fact: Mewtwo is genderless. In various appearances for entertainment media, Mewtwo's voice is masculine. This allows it to have a seemingly distinct male impression.

P3

Nice! Also, I think that Mewtwo is male cause in the movie his voice was more manly, but if you're talking about in the games, then yeah.