From StrategyWiki, the video game walkthrough and strategy guide wiki
Route 4 is a sort of one-way street—you can go from Mt. Moon to Cerulean City, but you can't do the opposite because of the small cliffs that make up the route. Only a few Trainers will challenge you on Route 4.
- Picnicker Hope
- Flaaffy (lvl. 34, 852 EXP) and 680
- Bird Keeper Hank
- Picknicker Sharon
- Ultra Ball (hidden)- North of first trainer, in the edge-enclosed square
- HP UP - North of Picnicker Sharon