Starter Pokémon:
* Treecko (Grass): Choose this starter at the beginning of the game.
* Torchic (Fire): Choose this starter at the beginning of the game.
* Mudkip (Water): Choose this starter at the beginning of the game.
Route 101:
* Poochyena: Found on the route.
* Zigzagoon: Found on the route.
* Ralts: Found on the route, though it's rare.
* Taillow: Found on the route.
* Wingull: Found on the route.
Petalburg Woods:
* Shroomish: Found in the woods.
* Seedot: Found in the woods.
* Surskit: Found in the woods, though it's rare.
* Lotad: Found in the woods, though it's rare.
Route 102:
* Wurmple: Found on the route.
* Spinda: Found on the route, though it's rare.
* Skitty: Found on the route, though it's rare.
Route 103:
* Nuzleaf: Found on the route.
* Sableye: Found on the route, though it's rare.
Route 104:
* Machop: Found on the route.
* Makuhita: Found on the route.
Rustboro City:
* Electrike: Found in the city.
Route 116:
* Plusle: Found in the area, but only after defeating the Gym Leader.
* Minun: Found in the area, but only after defeating the Gym Leader.
Route 117:
* Whismur: Found on the route.
* Loudred: Found on the route.
Route 118:
* Swablu: Found on the route.
* Spheal: Found on the route.
Route 119:
* Snorunt: Found on the route.
* Cacnea: Found on the route.
Route 120:
* Mawile: Found on the route.
* Gible: Found on the route, though it's very rare.
Slateport City:
* Luvdisc: Found in the city.
Route 121:
* Corphish: Found on the route.
Route 122:
* Clamperl: Found on the route.
Route 123:
* Carvanha: Found on the route.
Route 124:
* Barboach: Found on the route.
Route 125:
* Seviper: Found on the route.
* Vibrava: Found on the route.
Route 126:
* Wailmer: Found on the route.
Route 127:
* Tentacool: Found on the route.
* Tentacruel: Found on the route, though it's rare.
Route 128:
* Lileep: Found on the route.
* Anorith: Found on the route.
Route 129:
* Zubat: Found on the route.
* Golbat: Found on the route, though it's rare.
* Wingull: Found on the route.
Route 130:
* Volbeat: Found on the route.
* Illumise: Found on the route.
Ever Grande City:
* Bagon: Found in the city, though it's very rare.
Other Locations:
* Pokémon Ranch: This area, accessed via a special feature, can be used to store and breed Pokémon.
* Underground: Here, you'll find various fossils that can be revived into Pokémon.
* Secret Bases: These can be customized and may have different Pokémon appearing.
* Contests: Many Pokémon are attracted to specific contests, so you can find them here.
Evolving Pokémon:
* Wurmple: Evolves into either Silcoon or Cascoon.
* Silcoon: Evolves into Beautifly.
* Cascoon: Evolves into Dustox.
* Shroomish: Evolves into Breloom.
* Seedot: Evolves into Nuzleaf.
* Nuzleaf: Evolves into Shiftry.
* Lotad: Evolves into Lombre.
* Lombre: Evolves into Ludicolo.
* Electrike: Evolves into Manectric.
* Whismur: Evolves into Loudred.
* Loudred: Evolves into Exploud.
* Swablu: Evolves into Altaria.
* Spheal: Evolves into Sealeo.
* Sealeo: Evolves into Walrein.
* Snorunt: Evolves into Glalie.
* Cacnea: Evolves into Cacturne.
* Vibrava: Evolves into Flygon.
* Barboach: Evolves into Whiscash.
* Clamperl: Evolves into Huntail (with a Deep Sea Tooth) or Gorebyss (with a Deep Sea Scale).
* Lileep: Evolves into Cradily.
* Anorith: Evolves into Armaldo.
* Bagon: Evolves into Shelgon.
* Shelgon: Evolves into Salamence.
Note:
* Trading: Certain Pokémon are only available through trading with other players. This includes rare Pokémon like Bagon and Gible.
* Rare Spawns: Some Pokémon have very low encounter rates, requiring patience and luck.
* Hidden Abilities: Some Pokémon may have different abilities depending on their origin. This applies primarily to those caught in the wild.
Let me know if you have any other questions!