This is another piece for The Mewtwo Codex, done by TheSpeedDemon of DeviantArt - seriously, go check him out. There's some amazing Mewtwo stuff in that gallery.
This piece is the header art for the FAQ/About Me section - what better way for Mewtwo to see what data has been compiled on him than to go to the most known compendium for Pokemon information, Bulbapedia?