If the Jitte is moved after the "+2/+2" mode is announced but before it resolves, the bonus is given to the creature that is equipped when the ability resolves.
Umezawa's Jitte
The ability can be used any time Umezawa's Jitte's controller has priority — only the "target creature" choice has additional requirements. Choosing the "Equipped creature gets +2/+2 until end of turn" mode does nothing if the Jitte isn't equipped to a creature when the ability resolves.
If the "target creature gets -1/-1 until end of turn" mode is chosen, the target creature must also be announced.
Magic: The Gathering · ™ & © Wizards of the Coast · Illus. Christopher Moeller
Card data via Scryfall. Rarix is fan-made; not endorsed by the rights holders.
