86: Seel 88: Grimer

Dewgong

87: Dewgong

Kanto

	HeartGold	SoulSilver	FireRed	LeafGreen	Yellow	Red	Blue
Walking in tall grass or a cave
Icefall Cave entrance			20% L49–53	20% L49–53
Icefall Cave waterfall			20% L49–53	20% L49–53
Seafoam Islands B1F						4% L38	4% L38
Seafoam Islands B3F	24% L35–36	24% L35–36			5% L28–32	1% L37	1% L37
Seafoam Islands B3F			5% L32–34	5% L32–34
Seafoam Islands B4F	24% L37–38	24% L37–38			5% L30–34
Seafoam Islands B4F			10% L34–36	10% L34–36
	HeartGold	SoulSilver	FireRed	LeafGreen	Yellow	Red	Blue
Surfing
Icefall Cave entrance			5% L35–40	5% L35–40
Seafoam Islands B3F			5% L35–40	5% L35–40
Seafoam Islands B4F			5% L35–40	5% L35–40

Sinnoh

	Platinum	Diamond	Pearl
Walking in tall grass or a cave
Victory Road inside B1F	15% L48–50
	Platinum	Diamond	Pearl
Surfing
Sea Route 226		5% L40–55
Sea Route 230		5% L40–55
Victory Road inside B1F	30% L35–55