Pokémon FireRed and LeafGreen/Route 4

Route 4 is a short path in north Kanto from the eastern exit of Mt. Moon in the west to Cerulean City in the east. Though the official western terminus of Route 4 is at Route 3 south of Mt. Moon's western entrance, the western terminus is regarded by most to be Mt. Moon's eastern entrance.

Route description
From Mt.Moon, Route 4 travels to the east, swerving to the north and the south to avoid ledges along the route. The path turns north, then east near a large clump of trees surrounding a grassy area. To the east of this area is a ledge that separates Mt. Moon from Cerulean. By hopping down this ledge, the trainer cannot return to the previous towns until they travel through Diglett's Cave and use HM01 (Cut) on Route 2, or use Hm02 (Fly) to return to the cities.

The majority of the route is fairly straight-forward as there is only one true way to proceed on the path and there are no trainers to battle (with the exception of a Lass on the highest hill on the route; however, she is reached only by way of the waterway that begins on Route 24).

Items

 * TM05 - : near the center of the route on the second-highest hill

Pokémon
Ekans is pretty cool, because he comes with Wrap built in, and that's one of the best early skills in the game. Use it repeatedly against slower enemies to choke the life out of 'em while preventing them from ever getting an attack in edgewise. But on the down side, he doesn't really learn anything particularly interesting as he grows and evolves into. Ekans has a special ability, Intimidate, which may cause an enemy pokemon to have reduced attack power when Ekans is sent out.