Below is a table of all available Pokémon in Emerald Seaglass, along with their typing and locations. Note that many Pokémon have changed types to make them more interesting or fun to use. All Generation 1-3 Pokémon are available, along with their cross-gen evolutions (Weavile, Annihilape, etc.)! There are also some “easter egg” Pokémon, discussed below the table.
| # | Pokémon Name | Type 1 | Type 2 | Location |
| 1 | Bulbasaur | Grass | Poison | Wild: 114 |
| 2 | Ivysaur | Grass | Poison | Evolve Bulbasaur |
| 3 | Venusaur | Grass | Poison | Evolve Ivysaur |
| 4 | Charmander | Fire | – | Wild: Jagged Pass |
| 5 | Charmeleon | Fire | – | Evolve Charmander |
| 6 | Charizard | Fire | Flying | Evolve Charmeleon |
| 7 | Squirtle | Water | – | Surf: Petalburg |
| 8 | Wartortle | Water | – | Evolve Squirtle |
| 9 | Blastoise | Water | – | Evolve Wartortle |
| 10 | Caterpie | Bug | – | Wild: 103, Petalburg Woods |
| 11 | Metapod | Bug | – | Evolve Caterpie |
| 12 | Butterfree | Bug | Psychic | Wild: 127 |
| 13 | Weedle | Bug | Poison | Wild: 103, Petalburg Woods |
| 14 | Kakuna | Bug | Poison | Evolve Weedle |
| 15 | Beedrill | Bug | Poison | Wild: 127 |
| 16 | Pidgey | Flying | – | Wild: 104 |
| 17 | Pidgeotto | Flying | – | Wild: 128 |
| 18 | Pidgeot | Flying | – | Wild: 128 |
| 19 | Rattata | Normal | – | Wild: Littleroot, 110 |
| 20 | Raticate | Normal | – | Evolve Rattata |
