Route 201 lists 6 Pokémon across 36 encounter methods (grass (morning, emerald in the gba slot / leafgreen in the gba slot / ruby in the gba slot / sapphire in the gba slot), grass (morning, firered in the gba slot), grass (morning), grass (night, emerald in the gba slot / leafgreen in the gba slot / ruby in the gba slot / sapphire in the gba slot), and more), between level 2 and 3. 3 of them are on no other route's wild tables in this guide: Doduo, Nidoran♀, Nidoran♂.
Route 201 in other guides
The same area in other ROM hacks on this site. Each one has its own encounter table.
Grass (morning, Poké Radar, Emerald in the GBA slot / LeafGreen in the GBA slot / Ruby in the GBA slot / Sapphire in the GBA slot) Lv 2-3 · Diamond only
Grass (swarm, morning, Poké Radar, Emerald in the GBA slot / LeafGreen in the GBA slot / Ruby in the GBA slot / Sapphire in the GBA slot) Lv 2-3 · Diamond only
Grass (swarm, night, Poké Radar, Emerald in the GBA slot / LeafGreen in the GBA slot / Ruby in the GBA slot / Sapphire in the GBA slot) Lv 2-3 · Diamond only
Grass (swarm, morning, Poké Radar, Emerald in the GBA slot / LeafGreen in the GBA slot / Ruby in the GBA slot / Sapphire in the GBA slot) Lv 2-3 · Pearl only
Grass (swarm, night, Poké Radar, Emerald in the GBA slot / LeafGreen in the GBA slot / Ruby in the GBA slot / Sapphire in the GBA slot) Lv 2-3 · Pearl only