9: Blastoise 11: Metapod

Caterpie

10: Caterpie

Kanto

	HeartGold	SoulSilver	FireRed	LeafGreen	Crystal	Gold	Silver	Yellow	Red	Blue
Walking in tall grass or a cave
Pattern Bush			10% L6	10% L6
Route 2 north, towards Pewter City	+21% L3–4 +21% L3–4 +10% L3 +10% L3
Route 2 south, towards Viridian City	+21% L3–4 +21% L3–4 +10% L3 +10% L3		5% L4–5	5% L4–5	+30% L3 +30% L3	+30% L3 +30% L3				15% L3–5
Route 24			20% L7	20% L7	+60% L8–10 +50% L8–10					20% L7
Route 25			20% L8	20% L8	+30% L10 +30% L10				1% L8	20% L8
Viridian Forest	+40% L3 +40% L3		40% L3–5	40% L3–5				50% L3–6	5% L3	45% L3–5

Johto

	HeartGold	SoulSilver	Crystal	Gold	Silver
Walking in tall grass or a cave
Ilex Forest	+20% L5 +40% L5–6 +30% L5–6 +20% L5–6		+30% L5 +30% L5	+50% L5 +60% L5–6
National Park	+20% L10 +20% L10 +30% L10–12 +10% L10		+5% L10 +5% L10	+50% L10–12 +30% L10
Route 30	+20% L3 +25% L3–4 +30% L3–4 +10% L3		+50% L3–4 +50% L3–4	+50% L3–4 +35% L3–4
Route 31	+25% L4–5 +25% L4–5 +10% L4 +10% L4		+50% L4–5 +50% L4–5	+35% L4–5 +35% L4–5
Unknown; all bugs	100% L10–14

Sinnoh

	Platinum	Diamond	Pearl
Walking in tall grass or a cave
Eterna Forest	+4% L13
Route 204 north, towards Floaroma Town	+8% L10
Route 204 south, towards Jubilife City	+8% L5	+8% L6	+8% L6

Kalos

	X	Y
Walking in tall grass or a cave
Route 2		11% L3–4
Santalune Forest	10% L2	20% L2–3