87: Dewgong 89: Muk

Grimer

88: Grimer

Kanto

	HeartGold	SoulSilver	FireRed	LeafGreen	Crystal	Gold	Silver	Yellow	Red	Blue
Walking in tall grass or a cave
Pokémon Mansion 1F			5% L28	30% L28–30				20% L23–26	5% L30	40% L30–32
Pokémon Mansion 2F			5% L28	30% L28–30				35% L26–35	5% L30	45% L30–34
Pokémon Mansion 3F			5% L28	30% L28–30				35% L32–38	5% L34	35% L31–35
Pokémon Mansion B1F			5% L28	30% L28–30				40% L35–38	5% L35	50% L31–33
Power Plant								15% L33–37
Route 16	20% L26 +20% L27 +30% L26–28 +10% L27	20% L26 +20% L27 +30% L26–28 +10% L27			+50% L26–28 +50% L26–28 +80% L26–28	+50% L26–28 +50% L26–28 +80% L26–28	+50% L26–28 +50% L26–28 +80% L26–28
Route 17	+20% L27 +40% L27–28 +20% L29 +10% L27 +20% L27–28	+20% L27 +40% L27–28 +20% L29 +10% L27 +20% L27–28			+55% L29–33 +20% L29 +95% L29–33	+50% L27–29 +20% L29 +80% L27–29	+50% L27–29 +20% L29 +80% L27–29
Route 18	20% L26 +20% L27 +30% L26–28 +10% L27	20% L26 +20% L27 +30% L26–28 +10% L27			+50% L26–28 +50% L26–28 +95% L26–29	+50% L26–28 +50% L26–28 +80% L26–28	+50% L26–28 +50% L26–28 +80% L26–28
	HeartGold	SoulSilver	FireRed	LeafGreen	Crystal	Gold	Silver	Yellow	Red	Blue
Fishing with a Super Rod
Celadon City			1% L30–40	1% L30–40
	HeartGold	SoulSilver	FireRed	LeafGreen	Crystal	Gold	Silver	Yellow	Red	Blue
Surfing
Celadon City	90% L15–20	90% L15–20			90% L15–24	90% L15–24	90% L15–24

Hoenn

	Emerald	Ruby	Sapphire
Walking in tall grass or a cave
Fiery Path	2% L14	2% L14	25% L15–16

Sinnoh

	Platinum	Diamond	Pearl
Walking in tall grass or a cave
Route 212 east, towards Pastoria City	+22% L23–26	+22% L18–20	+22% L18–20

Unova

	Black 2	White 2	Black	White
Walking in tall grass or a cave
Castelia Sewers	10% L15–17	10% L15–17
Castelia Sewers unknown area 38	10% L15–17	10% L15–17
	Black 2	White 2	Black	White
Fishing with a Super Rod
Castelia Sewers	100% L40–70	100% L40–70
Castelia Sewers unknown area 38	100% L40–70	100% L40–70
	Black 2	White 2	Black	White
Surfing
Castelia Sewers	100% L5–15	100% L5–15
Castelia Sewers unknown area 38	100% L5–15	100% L5–15
	Black 2	White 2	Black	White
Fishing in dark spots
Castelia Sewers	80% L40–60	80% L40–60
Castelia Sewers unknown area 38	80% L60	80% L60
	Black 2	White 2	Black	White
Surfing in dark spots
Castelia Sewers	95% L5–20	95% L5–20
Castelia Sewers unknown area 38	95% L5–20	95% L5–20