While any Pokémon can be used to beat the game, some stand out for their accessibility and effectiveness during the main story. Here are a few strong recommendations:

- Starter Pokémon (Torterra, Infernape, Empoleon): Your chosen starter will be a cornerstone of your team. They all have good stats and type combinations.
- Staraptor (Normal/Flying): Caught as Starly early on. Excellent Speed and Attack, learns powerful Flying-type moves like Brave Bird. Essential for Fly HM.
- Luxray (Electric): Caught as Shinx early on. Strong Attack, good for Electric-type coverage.
- Garchomp (Dragon/Ground): Caught as Gible in Wayward Cave (requires Flash). A pseudo-legendary with incredible Attack and Speed. A late-game powerhouse.
- Gardevoir (Psychic/Fairy): Caught as Ralts on Route 203. Strong Special Attack, good Psychic-type coverage.
- Gyarados (Water/Flying): Caught as Magikarp (fishing). Evolves at Lv. 20. High Attack, good Water-type coverage, and can learn Dragon Dance. Essential for Surf/Waterfall HMs.
- Roserade (Grass/Poison): Caught as Budew on Route 204. Strong Special Attack, good Grass/Poison coverage.
Remember to diversify your team's types and movesets to handle various Gym Leaders and trainers effectively.