10: Caterpie 12: Butterfree

Metapod

11: Metapod

Kanto

	HeartGold	SoulSilver	FireRed	LeafGreen	Crystal	Gold	Silver	Yellow	Red	Blue
Walking in tall grass or a cave
Pattern Bush			5% L9	5% L9
Route 2 north, towards Pewter City	+20% L5
Route 2 south, towards Viridian City	+20% L5 +20% L5					+20% L5 +20% L5
Route 24			1% L8	4% L8	+20% L12					20% L8
Route 25			1% L9	4% L9	+10% L12 +10% L12				4% L7	20% L9
Viridian Forest	+30% L3–5 +30% L3–5		5% L5	10% L4–6				25% L4–6	5% L4	40% L4–6

Johto

	HeartGold	SoulSilver	Crystal	Gold	Silver
Walking in tall grass or a cave
Ilex Forest	+20% L6 +10% L5 +10% L6 +20% L6		+20% L7 +20% L7	+30% L6 +30% L5–6
National Park	+20% L10 +20% L10 +10% L10 +10% L10			+30% L10 +30% L10
Route 30	+10% L4 +15% L4			+10% L4 +15% L4–5
Route 31	+15% L5 +15% L5			+15% L5 +15% L5–6

Sinnoh

	Platinum	Diamond	Pearl
Walking in tall grass or a cave
Eterna Forest	+4% L13	+8% L12	+8% L12

Unova

	Black 2	White 2	Black	White
Walking in tall grass or a cave
Route 12				10% L48
	Black 2	White 2	Black	White
Walking in dark grass
Route 12				10% L59

Kalos

	X	Y
Walking in tall grass or a cave
Santalune Forest		4% L4