Mewtwo is a Legendary Pokémon that was created in the shadow of Mew. After many years of searching, Pokémon Scientist Researchers found the Legendary
Route 2 (Sun/Moon) - Pokemon Sun & Pokemon Moon Guide - IGN
How to Catch Mewtwo - Pokemon X and Y Guide - IGN
Pokémon Scarlet and Violet Getting Mew and Mewtwo - IGN
What's going on with Mewtwo in the dex? - Pokémon Go General Chat - GO Hub Forum
Mewtwo Pokédex
Graveler - Pokemon Red, Blue and Yellow Guide - IGN
Mega Mewtwo Y - Pokemon Omega Ruby and Alpha Sapphire Guide - IGN
Legendary Pokemon - Pokemon X and Y Guide - IGN
Mew - Pokemon Red, Blue and Yellow Guide - IGN
Mewtwo Pokemon Go Pokedex Entry, Graphics, Candies and more!
6IV Ultra Shiny Mewtwo Square Shiny Pokemon Sword & Shield
Treecko - Pokedex Guide - IGN
Mewtwo Guide: Moveset, Weaknesses, and Counters - Pokemon GO Guide - IGN