Route 4

Route west of Dresco Town. Contains Grim Woods and Cinder Volcano. Leads to Route 5. Route 13 can be accessed from the portion of the route in-between Grim Woods and Cinder Volcano, east of Nurse Laura.

Miscellaneous
Trainer Tips signs
 * "In a battle, you can check your Pokémon's moves for details..." (near Grim Woods exit)
 * "Talk to Lapras to ride it down the waterfall!" (near Cinder Volcano exit)