Setting: Mother's Study, some places he flies through really fast
Time: Night 003, the GODDAMN INSTANT THAT GREENHOUSE DOOR OPENS.... and then some time later.
Summary: Mewtwo, meet Mio. Mio, Mewtwo. Charmed, I'm sure.
Mewtwo shot out the door the instant he was freed, pausing only long enough to light with a brilliant blaze of blue light before launching himself through the doorway at high speeds. He threw aside the zombies angrily as he burst from the hallway--with his Barrier up, they could not touch him (they were physical beings and attacks, after all) and he rose above them swiftly in telekinetic flight, bypassing the hordes without even a thought as to his erstwhile companions. The long-awaited freedom compelled him to tear along the ceiling and out of sight before he was trapped someway else--the mere idea made him flare brighter as he rocketed out of sight. Zetsu seemed capable enough, and the rest... they would survive, or they would not. He did not care.
He had a house to explore.
The Pokémon wove swiftly through the greenhouse where he and Zetsu had had their battle--a different greenhouse from before, wilder and more dangerous, but of no consequence to him; Mewtwo had no interest in plants--attacking or otherwise--least of all now, when he was impatient and out of indulgences. Flying through the Grand Room, he took no notice of anyone below him, whether they needed help or not--instead he meant to begin his investigation... starting with the downstairs.