95: Onix 97: Hypno

Drowzee

96: Drowzee

Kanto

	HeartGold	SoulSilver	FireRed	LeafGreen	Crystal	Gold	Silver	Yellow	Red	Blue
Walking in tall grass or a cave
Berry Forest			10% L34	10% L34
Route 11	30% L14–16 +10% L14	30% L14–16 +10% L14	25% L11–15	25% L11–15	+30% L14	40% L14–16	40% L14–16	24% L15–19	25% L9–15	25% L9–15
Route 6					+30% L13

Johto

	HeartGold	SoulSilver	Crystal	Gold	Silver
Walking in tall grass or a cave
Route 34	+20% L10 +30% L10–12	+20% L10 +30% L10–12	+30% L12	50% L10–12	50% L10–12
Route 35	+20% L14	+20% L14	+30% L12	+20% L14 +20% L14 +20% L14	+20% L14 +20% L14 +20% L14

Sinnoh

	Platinum	Diamond	Pearl
Walking in tall grass or a cave
Route 215	+40% L19–20	+40% L20–21	+40% L20–21