Sea Route 21
Pokemon Red and Blue
| Pokemon | Levels | Method | Rarity |
|---|---|---|---|
 Goldeen | 15 | Fishing with a Super Rod | 25% |
| Goldeen | 10 | Fishing with a Good Rod | 50% |
 Horsea | 15 | Fishing with a Super Rod | 25% |
 Magikarp | 5 | Fishing with an Old Rod | 100% |
 Pidgeotto | 30-32 | Walking in tall grass or a cave | 15% |
 Pidgey | 21-23 | Walking in tall grass or a cave | 30% |
 Poliwag | 10 | Fishing with a Good Rod | 50% |
 Raticate | 30 | Walking in tall grass or a cave | 15% |
 Rattata | 21-23 | Walking in tall grass or a cave | 30% |
 Shellder | 15 | Fishing with a Super Rod | 25% |
 Staryu | 15 | Fishing with a Super Rod | 25% |
 Tangela | 28-32 | Walking in tall grass or a cave | 10% |
 Tentacool | 5-40 | Surfing | 100% |
Pokemon Yellow
| Pokemon | Levels | Method | Rarity |
|---|---|---|---|
| Goldeen | 10 | Fishing with a Good Rod | 50% |
| Magikarp | 5 | Fishing with an Old Rod | 100% |
| Pidgeotto | 15-19 | Walking in tall grass or a cave | 10% |
| Pidgey | 11-17 | Walking in tall grass or a cave | 55% |
| Poliwag | 10 | Fishing with a Good Rod | 50% |
| Raticate | 15 | Walking in tall grass or a cave | 5% |
| Rattata | 13-15 | Walking in tall grass or a cave | 30% |
| Staryu | 20 | Fishing with a Super Rod | 30% |
| Tentacool | 5-40 | Surfing | 100% |
| Tentacool | 15-30 | Fishing with a Super Rod | 60% |
 Tentacruel | 30 | Fishing with a Super Rod | 10% |
Pokemon HeartGold and SoulSilver
| Pokemon | Levels | Method | Rarity |
|---|---|---|---|
 Bidoof | 35 | Walking in tall grass or a cave | 20% |
 Buizel | 25-30 | Walking in tall grass or a cave | 20% |
 Chinchou | 20 | Fishing with a Good Rod | 20% |
| Chinchou | 40 | Fishing with a Super Rod | 40% |
 Lanturn | 40 | Fishing with a Super Rod | 10% |
 Linoone | 35 | Walking in tall grass or a cave | 20% |
| Magikarp | 20 | Fishing with a Good Rod | 40% |
| Magikarp | 10 | Fishing with an Old Rod | 85% |
 Mr. Mime | 28-30 | Walking in tall grass or a cave | 10% |
| Shellder | 40 | Fishing with a Super Rod | 30% |
| Shellder | 20 | Fishing with a Good Rod | 10% |
| Tangela | 20-35 | Walking in tall grass or a cave | 100% |
| Tentacool | 20 | Fishing with a Good Rod | 30% |
| Tentacool | 30-35 | Surfing | 90% |
| Tentacool | 10 | Fishing with an Old Rod | 15% |
| Tentacruel | 40 | Fishing with a Super Rod | 20% |
| Tentacruel | 35 | Surfing | 10% |
 Whismur | 25-30 | Walking in tall grass or a cave | 20% |