Well, as in the Sinnoh Region, yes, the mud will slow you down and you will be stuck.
Now... I have a huge surprise for you guys! Here is the beautiful map of the Lookin Region!
* The cities/towns' motto are write beside them *
1. Rauwolfia Town " Where the adventure blooms "
2. Crescent Town " The relaxation town "
3. Elloish City " Hello here, hello there "
4. Westbeach City " Peace & love "
5. Purearth City " The anti-polluting city "
6. Minerhole Town " Paradise of golden treasures "
7. Raynergie City " Energized life "
8. Irogrey City " Magnificent place "
9. Padding City " Elevated for love "
10. Herbolodge City " The green way "
11. Lunar Town " Where the sky tells the truth "
12. Camplains Town " Sweet lovers & sour powers "
13. Blueport City " The port metropolis "
14. Neosula City " Feet in sand "
15. Palmapap City " Tropical civilization "
16. Atalana Town " Free your mind "
17. Coralbem City " Multi-dash bay "
A. Prisma Cave
B. Minerhole Dig
C. Irogrey Forest
D. Herbolodge's Pasture (Verdure Park)
E. Mt. Zenith
F. Verpical Woods
G. Victory Road
H. Skypo Island
I. Under Ground Path Exit/Enter (One of the part of the tunnel will be already open. After you beat the Pokemon League, the second part will be open)
J. Under Ground Path Exit/Enter