Sinnoh:

Sunyshore city, because of the music, and the look of it, and Volkner!💕

X3

Hoenn:

Slateport city, cause it's by the ocean, and it's just a beautiful city in general!

Johto:

Ecruteak City!!

Because it's so awesome!

Kanto:

Cerulean City! I like the music in soul silver!

Unova:

Humilau city... I think I spelled that right XD

Kalos:

Snowbelle City! Cause the music is so good!!!!

X3