22: Fearow 24: Arbok

Ekans

23: Ekans

Kanto

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

Johto

	HeartGold	SoulSilver	Crystal	Gold	Silver
Walking in tall grass or a cave
Route 32		20% L4 +10% L4	+30% L4 +30% L4		+30% L4 +30% L4 +30% L4
Route 33		20% L7 +10% L7	+5% L7 +5% L7		+30% L7 +30% L7 +30% L7
Route 42			+30% L13 +30% L13

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