Part 1: Just started — no badges

Just started — no badges 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. Route 101

   Wild: Poochyena 45% · Lv 2-3, Wurmple 45% · Lv 2-3, Zigzagoon 10% · Lv 2-3, Mudkip Lv 5 +2 more

2. Route 102

   Wild: Corphish 100% · Lv 20-45, Marill 99% · Lv 5-35, Magikarp 70% · Lv 5-10, Goldeen 30% · Lv 5-10 +6 more

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

3. Route 103

   Wild: Magikarp 70% · Lv 5-10, Poochyena 60% · Lv 2-4, Tentacool 60% · Lv 5-35, Wailmer 60% · Lv 25-45 +4 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

4. Route 104

   Wild: Magikarp 100% · Lv 5-10, Wingull 95% · Lv 10-30, Poochyena 40% · Lv 4-5, Marill 20% · Lv 4-5 +3 more

   Trainers: ★ Rival Brendan (Mudkip) Lv 15, ★ Rival Brendan (Torchic) Lv 15, ★ Rival Brendan (Treecko) Lv 15, ★ Rival May (Mudkip) Lv 15, ★ Rival May (Torchic) Lv 15, ★ Rival May (Treecko) Lv 15 +7 more

   Pick up: TM09 Bullet Seed

5. Route 116

   Wild: Poochyena 28% · Lv 6-8, Nincada 20% · Lv 6-7, Taillow 20% · Lv 6-8, Whismur 20% · Lv 6 +2 more

   Trainers: Bug Catcher Jose Lv 8, Hiker Clark Lv 8, Hiker Devan Lv 8, Lady Sarah Lv 8, Lass Janice Lv 9, Rich Boy Dawson Lv 8 +4 more

6. Petalburg Woods

   Wild: Poochyena 30% · Lv 5-6, Wurmple 25% · Lv 5-6, Shroomish 15% · Lv 5-6, Cascoon 10% · Lv 5 +3 more

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

7. Rusturf Tunnel

   Wild: Whismur 100% · Lv 5-8

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

   Pick up: HM04 Strength

8. Route 115

   Wild: Wailmer 100% · Lv 20-45, Magikarp 70% · Lv 5-10, Tentacool 60% · Lv 5-35, Taillow 40% · Lv 23-25 +5 more

   Trainers: Battle Girl Cyndy Lv 18, Battle Girl Helene Lv 26, Black Belt Koichi Lv 28, Black Belt Nob Lv 19, Collector Hector Lv 18, Expert Timothy Lv 27 +4 more

   Pick up: TM01 Focus Punch

9. Petalburg City

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

   Pick up: TM42 Facade, HM03 Surf

10. Littleroot Town

    Wild: Chikorita Lv 5, Cyndaquil Lv 5, Totodile Lv 5

11. Rustboro City

    Wild: Anorith Lv 20, Lileep Lv 20, Seedot Lv 4-100

    Pick up: TM39 Rock Tomb, HM01 Cut

★ Rival Brendan (Mudkip) — Route 103

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

	Pokémon	Moves
	Treecko Lv 5 · Overgrow	Pound Leer

★ Rival Brendan (Torchic) — Route 103

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

	Pokémon	Moves
	Mudkip Lv 5 · Torrent	Tackle Growl

★ Rival Brendan (Treecko) — Route 103

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

	Pokémon	Moves
	Torchic Lv 5 · Blaze	Scratch Growl

Also fought around here

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

This game's documentation doesn't say where 8 of its 518 fights happen, so those trainers are on no part of this walkthrough; they are all on the Trainers page. It also doesn't say when 11 of its areas open up, so they are listed together in the last part rather than guessed into the story.