22: Fearow 24: Arbok

Ekans

23: Ekans

Kanto

	HeartGold	SoulSilver	FireRed	LeafGreen	Yellow	Red	Blue
Walking in tall grass or a cave
Route 10						25% L11–17
Route 10			25% L11–17
Route 11			40% L12–15
Route 11						40% L12–15
Route 23			20% L32–34
Route 23						20% L26
Route 3		+20% L8
Route 4		+20% L8				25% L6–12
Route 4			25% L6–12
Route 8						20% L17–19
Route 8			20% L17–19
Route 9						25% L11–17
Route 9			25% L11–17

Johto

	HeartGold	SoulSilver
Walking in tall grass or a cave
Route 32		20% L4 +10% L4
Route 33		20% L7 +10% L7

Sinnoh

	Platinum	Diamond	Pearl
Walking in tall grass or a cave
Route 212 east, towards Pastoria City	+8% L23–26	+8% L18–20	+8% L18–20