>>50493270My favorite Hoenn route: the one OP posted.
Now for the others, lets see...
Kanto: Cycling Road but just because it's the fastest way to Fuchsia.
Johto: Route 44 is comfy.
Sinnoh: perhaps the snowy one between Mt. Coronet and the resting lodge - you know, the one before the HEAVY BLIZZARD
Unova: Routes 4 and 10, with the route right of Lentimas coming close.
Kalos: never connected as much with its late-game routes, so prob'ly Route 7, since there's a lot of stuff in it.
Alola: surprisingly, none. Its routes are cool but they blend with the cities and other places a lot, so it's hard to feel attached to them.
Yeah, I think Hoenn Route 119 is my fav too.