19: Rattata 21: Spearow

Raticate

20: Raticate

Kanto

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

Johto

	HeartGold	SoulSilver
Walking in tall grass or a cave
Burned Tower 1F	5% L15	5% L15
Mt. Mortar B1F	5% L16	5% L16
Mt. Mortar Upper Cave	10% L30	10% L30
Route 38	+20% L16 +10% L16	+20% L16 +10% L16
Route 39	20% L17 +10% L17	20% L17 +10% L17
Route 47	5% L31–33	5% L31–33
Tohjo Falls	20% L22 +10% L22	20% L22 +10% L22
Union Cave B2F	20% L22 +10% L22	20% L22 +10% 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