19: Rattata 21: Spearow

Raticate

20: Raticate

Kanto

	HeartGold	SoulSilver	FireRed	LeafGreen	Crystal	Gold	Silver	Yellow	Red	Blue
Walking in tall grass or a cave
Pokémon Mansion 1F			30% L32–36	30% L32–36				30% L34–37
Pokémon Mansion 2F			30% L32–36	30% L32–36				30% L37–40
Pokémon Mansion 3F			30% L32–36	30% L32–36				30% L40–43
Pokémon Mansion B1F			30% L34–38	30% L34–38				40% L37–46
Route 1					+5% L6
Route 10	+5% L18 +5% L18 +20% L16	+5% L18 +5% L18 +20% L16			+20% L15 +20% L15 +20% L15	+20% L16 +20% L17 +25% L16–18	+20% L16 +20% L17 +25% L16–18	5% L20
Route 11					+30% L15 +30% L15 +5% L16			1% L17
Route 16			5% L23–25	5% L23–25				5% L25–26	5% L23–25	5% L23–25
Route 17			25% L25–29	25% L25–29					30% L25–29	30% L25–29
Route 18			15% L25–29	15% L25–29				5% L25–26	20% L25–29	20% L25–29
Route 26	+5% L30 +5% L30 +30% L28–30 +10% L28	20% L28 +5% L30 +5% L30 +20% L28 +10% L28 +10% L28			+10% L30 +10% L30 +40% L28–30	+4% L30 +5% L30 +40% L28–30	+34% L28–30 +35% L28–30 +70% L28–30
Route 27	30% L28–30 +10% L28	+10% L30 +20% L30 +20% L30			+20% L30 +20% L30 +20% L30	+30% L28 +40% L28–30 +40% L28–30	+10% L30 +10% L30
Route 3					+15% L10 +15% L10 +20% L10
Route 4					+15% L10 +15% L10 +20% L10
Route 6					+10% L15 +10% L15 +5% L15
Route 7	10% L19	10% L19			+10% L18 +10% L18	+10% L19 +10% L19 +10% L19	+10% L19 +10% L19 +10% L19
Route 9	+10% L15 +10% L15 +5% L15 +20% L13	5% L15 +10% L15 +10% L15 +5% L15 +20% L13			+20% L15 +20% L15 +25% L15–18	+10% L15 +10% L15 +25% L15	+15% L15 +15% L15 +30% L15	4% L20
Sea Route 21					+10% L20 +10% L20 +10% L20			5% L15	15% L30	15% L30

Johto

	HeartGold	SoulSilver	Crystal	Gold	Silver
Walking in tall grass or a cave
Burned Tower 1F	5% L15	5% L15	5% L15	5% L15	5% L15
Mt. Mortar 1F			+5% L16 +5% L16 +5% L16
Mt. Mortar B1F	5% L16	5% L16	+5% L18 +5% L18 +5% L18	5% L16	5% L16
Mt. Mortar Lower Cave			+10% L14 +10% L14 +20% L15
Mt. Mortar Upper Cave	10% L30	10% L30	+10% L30 +10% L30 +20% L30	10% L30	10% L30
Route 38	+20% L16 +10% L16	+20% L16 +10% L16	+30% L16 +30% L16 +30% L16	+30% L16 +30% L16 +30% L16 +30% L16	+30% L16 +30% L16 +30% L16 +30% L16
Route 39	20% L17 +10% L17	20% L17 +10% L17	+30% L16 +30% L16 +30% L16	+30% L17 +30% L17 +30% L17	+30% L17 +30% L17 +30% L17
Route 42			+10% L16 +10% L16 +20% L15
Route 43			+5% L17 +5% L17 +25% L16–17
Route 47	5% L31–33	5% L31–33
Tohjo Falls	20% L22 +10% L22	20% L22 +10% L22	30% L22	30% L22	30% L22
Union Cave B2F	20% L22 +10% L22	20% L22 +10% L22	+10% L21 +10% L21 +10% L21	30% L22	30% L22

Sinnoh

	Platinum	Diamond	Pearl
Walking in tall grass or a cave
Route 225	5% L49 +10% L50	+20% L50 +10% L52	+20% L50 +10% L52
Sea Route 226	5% L49 +10% L50	+20% L52 +10% L51	+20% L52 +10% L51

Unova

	Black 2	White 2	Black	White
Walking in tall grass or a cave
Dreamyard	10% L57	10% L57
Relic Passage Relic Castle entrance	10% L29	10% L29
Strange House 1F	15% L32–33	15% L32–33
Strange House B1F	15% L32–33	15% L32–33
	Black 2	White 2	Black	White
Walking in dark grass
Dreamyard	10% L65	10% L65	10% L48	10% L48
Dreamyard B1F	25% L64–67	25% L64–67	35% L47–50	35% L47–50