Part 2: Beat Roxanne — Rustboro City Gym, badge 1

the Old Rod (Dewford Town). Level cap 15.

Beat Roxanne — Rustboro City Gym, badge 1 opens 2 areas. There are 8 trainers standing in them. The fight at this checkpoint is Roxanne.

Where to go

1. Dewford Town

   Wild: Wailmer 100% · Lv 20-45, Magikarp 70% · Lv 5-10, Tentacool 60% · Lv 5-35, Wingull 35% · Lv 10-30 +10 more

   Pick up: TM08 Bulk Up, TM36 Sludge Bomb

2. Rustboro City Gym

   Trainers: Hiker Marc Lv 8, Youngster Tommy Lv 8, Youngster Josh Lv 10, ★ Roxanne Lv 15, ★ Roxanne (Rematch 1) Lv 37, ★ Roxanne (Rematch 2) Lv 42 +2 more

★ Roxanne — Rustboro City Gym

3 Pokémon · level cap Lv 15 (every cap) · Roxanne’s own page

	Pokémon	Ability & item	Moves	Base stats
	Anorith Lv 12 RockBug	Ability Battle Armor	Tackle Harden Bubble Smack Down	HP50Attack95Defense50Sp. Atk40Sp. Def50Speed75Total360
	Lileep Lv 12 RockGrass	Ability Suction Cups	Acid Ingrain Absorb Rock Tomb	HP71Attack41Defense77Sp. Atk61Sp. Def87Speed23Total360
	Nosepass Lv 15 Rock	Ability Sturdy Held item Oran Berry	Block Harden Tackle Rock Tomb	HP30Attack45Defense135Sp. Atk45Sp. Def90Speed30Total375

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.