Part 1: No badges yet

Rock Smash and Surf are both a few badges off yet.

No badges yet opens 11 areas. There are 56 trainers standing in them. The fights at this checkpoint are Rival Brendan (Mudkip), Rival Brendan (Torchic), Rival Brendan (Treecko), and 3 more.

Where to go

1. Littleroot Town

   Wild: Drowzee 20% · Lv 5-8, Mareep 20% · Lv 5-8, Natu 20% · Lv 5-8, Eevee 10% · Lv 5-8 +5 more

2. Petalburg City

   Wild: Corphish 100% · Lv 20-45, Marill 90% · Lv 10-30, Magikarp 70% · Lv 5-10, Goldeen 30% · Lv 5-10 +1 more

   Pick up: TM42 Facade

3. Petalburg Woods

   Wild: Wurmple 25% · Lv 5-6, Ledyba 20% · Lv 5, Cascoon 10% · Lv 5, Shroomish 10% · Lv 5 +6 more

   Trainers: Bug Catcher Lyle Lv 3, Bug Catcher James Lv 6, Team Aqua Grunt Lv 9

4. Route 101

   Wild: Zigzagoon 35% · Lv 2-3, Poochyena 20% · Lv 2, Wurmple 20% · Lv 2, Sentret 15% · Lv 3 +1 more

5. Route 102

   Wild: Corphish 100% · Lv 20-45, Marill 99% · Lv 5-35, Magikarp 70% · Lv 5-10, Goldeen 30% · Lv 5-10 +10 more

   Trainers: Bug Catcher Rick Lv 4, Lass Tiana Lv 4, Youngster Allen Lv 4, Youngster Calvin Lv 5

6. Route 103

   Wild: Magikarp 70% · Lv 5-10, Tentacool 60% · Lv 5-35, Wailmer 60% · Lv 25-45, Sharpedo 40% · Lv 30-35 +8 more

   Trainers: ★ Rival Brendan (Mudkip) Lv 5, ★ Rival Brendan (Torchic) Lv 5, ★ Rival Brendan (Treecko) Lv 5, ★ Rival May (Mudkip) Lv 5, ★ Rival May (Torchic) Lv 5, ★ Rival May (Treecko) Lv 5 +8 more

7. Route 104

   Wild: Magikarp 100% · Lv 10-30, Wingull 60% · Lv 10-30, Yanma 35% · Lv 15-25, Krabby 30% · Lv 5-10 +7 more

   Trainers: Lass Haley Lv 6, Twins Gina & Mia Lv 6, Fisherman Ivan Lv 7, Lady Cindy Lv 7, Rich Boy Winston Lv 7, Youngster Billy Lv 7 +7 more

   Pick up: TM09 Bullet Seed

8. Route 115

   Wild: Magikarp 70% · Lv 5-10, Tentacool 60% · Lv 5-35, Wailmer 60% · Lv 20-45, Chinchou 40% · Lv 25-30 +12 more

   Trainers: Battle Girl Cyndy Lv 18, Collector Hector Lv 18, Psychic Marlene Lv 18, Black Belt Nob Lv 19, Battle Girl Helene Lv 26, Ninja Boy Jaiden Lv 26 +4 more

9. Route 116

   Wild: Aipom 20% · Lv 6, Pichu 20% · Lv 6, Nincada 14% · Lv 6-7, Abra 10% · Lv 7 +4 more

   Trainers: Bug Catcher Jose Lv 8, Hiker Clark Lv 8, Hiker Devan Lv 8, Lady Sarah Lv 8, Rich Boy Dawson Lv 8, Youngster Johnson Lv 8 +4 more

10. Rustboro City

    Wild: Chingling 40% · Lv 5-8, Growlithe 10% · Lv 5, Mankey 10% · Lv 5, Taillow 10% · Lv 5 +4 more

    Pick up: TM39 Rock Tomb

11. Rusturf Tunnel

    Wild: Whismur 50% · Lv 6-7, Meditite 20% · Lv 5-8, Snorunt 10% · Lv 6, Snubbull 10% · Lv 5-8 +1 more

    Trainers: Team Aqua Grunt Lv 11, Hiker Mike Lv 16

★ Rival Brendan (Mudkip) — Route 103

1 Pokémon · level cap Lv 5 (every cap) · Rival Brendan (Mudkip)’s own page

	Pokémon	Ability & item	Moves	Base stats
	Treecko Lv 5 Grass	Ability Overgrow	Pound Leer	HP40Attack65Defense35Sp. Atk45Sp. Def55Speed70Total310

★ Rival Brendan (Torchic) — Route 103

1 Pokémon · level cap Lv 5 (every cap) · Rival Brendan (Torchic)’s own page

	Pokémon	Ability & item	Moves	Base stats
	Mudkip Lv 5 Water	Ability Torrent	Tackle Growl	HP50Attack70Defense50Sp. Atk50Sp. Def50Speed40Total310

★ Rival Brendan (Treecko) — Route 103

1 Pokémon · level cap Lv 5 (every cap) · Rival Brendan (Treecko)’s own page

	Pokémon	Ability & item	Moves	Base stats
	Torchic Lv 5 Fire	Ability Blaze	Scratch Growl	HP45Attack60Defense40Sp. Atk70Sp. Def50Speed45Total310

Also fought around here

Everything you can have caught by this checkpoint · Open the interactive guide

It also doesn't say when Altering Cave, Scorched Slab open up, so they are in no part above; each has its own route page.