Hello Gurpreet! Welcome to planDisney! Much like the Galactic Federation, it sounds like you too are searching for Experiment 626, or as we know him, Stitch!
You are correct that Stitch (and Lilo too) can be found greeting Guests during breakfast from 7:30 AM to 12:00 PM in
‘Ohana at Disney’s Polynesian Village Resort! I strongly encourage you to continue checking regularly for reservations as they do become available. You should even check for “day of” reservations!
If you’re unable to get to ‘Ohana to meet Stitch, our little blue friend can occasionally be found in Tomorrowland at
Magic Kingdom Park! Stitch will appear on the Rocket Tower Plaza Stage in Tomorrowland. This is an area that can be found close to Space Mountain and Astro Orbiter. This is not considered a traditional character “meet and greet” but Stitch will come out on stage to wave and engage in some general silliness. While Guests are not allowed to go on stage with Stitch, he will stand still just long enough to capture a selfie-style photograph with him in the background. While times are not posted for appearances if you ask a Tomorrowland Cast Member, they might be able to give you a good idea of when Stitch tends to cause the most chaos!
Good luck tracking down that mischievous alien!
Happy Planning!
Jonathan