Mossfell Confluence — 1 location on the interactive map.
Cerulean Cave, Route 12, Route 13, Route 14, Route 15 — 5 locations on the interactive map.
Route 24, Route 25, Route 44 — 3 locations on the interactive map.
Bellsprout → Weepinbell (Level 21) → Victreebel (Leaf Stone)