Part 4: Thunder Badge — Rock Tunnel to Celadon City — Lv. 35 cap

Routes 7 to 10, Rock Tunnel, Lavender Town, the Power Plant, Celadon City and the Rocket Hideout, up to Erika. Rocks can be smashed from here, which opens Mt. Moon Square and the floor under Rock Tunnel. Fly works from here too.

Thunder Badge — Rock Tunnel to Celadon City — Lv. 35 cap opens 20 areas. There are 91 trainers standing in them. The fights at this checkpoint are Boss Giovanni, Erika, Erika (once you have beaten Sabrina), and 4 more.

Where to go

1. Celadon City

   Wild: Magikarp 100% · Lv 5, Psyduck 95% · Lv 5-30, Slowpoke 95% · Lv 5-30, Grimer 20% · Lv 20-25 +1 more

   Pick up: TM05 Roar, TM10 Hidden Power, TM15 Hyper Beam, TM19 Giga Drain, TM28 Dig, TM31 Brick Break, TM43 Secret Power, TM45 Attract +4 more

   Move tutor: Softboiled

2. Celadon City Condominiums Roof Room

   Wild: Eevee Lv 25

3. Mt. Moon Square

   Wild: Clefairy 20% · Lv 21, Jigglypuff 20% · Lv 21, Nidoran♀ 10% · Lv 21, Nidoran♂ 10% · Lv 21 +7 more

   Pick up: Moon Stone (hidden)

4. Power Plant

   Wild: Elekid 20% · Lv 38-40, Magnemite 20% · Lv 38, Pikachu 20% · Lv 39, Voltorb 20% · Lv 38 +8 more

   Trainers: Scientist Craig Lv 50

   Pick up: TM17 Protect, TM24 Thunderbolt, TM25 Thunder, Elixir, Max Elixir (hidden), Thunder Stone, Thunder Stone (hidden), Thunder Stone +1 more

5. Rock Tunnel 1F

   Wild: Geodude 35% · Lv 21-23, Zubat 30% · Lv 22-23, Machop 15% · Lv 22-23, Mankey 15% · Lv 21-23 +3 more

   Trainers: Picnicker Ariana Lv 23, Picnicker Dana Lv 23, Hiker Oliver Lv 24, Picnicker Leah Lv 24, Hiker Lenny Lv 25, Hiker Lucas Lv 25 +1 more

   Pick up: Escape Rope, Everstone, Pearl

6. Rock Tunnel B1F

   Wild: Geodude 60% · Lv 15-25, Onix 40% · Lv 20-25, Zubat 30% · Lv 21-22, Mankey 15% · Lv 21-23 +4 more

   Trainers: Hiker Dudley Lv 23, Hiker Eric Lv 23, Picnicker Sofia Lv 23, Pokémaniac Cooper Lv 23, Picnicker Martha Lv 24, Pokémaniac Winston Lv 25 +3 more

   Pick up: TM37 Sandstorm, Max Ether

   Move tutor: Rock Slide

7. Rock Tunnel B2F

   Wild: Sandshrew 30% · Lv 21-23, Geodude 20% · Lv 21, Onix 18% · Lv 22-24, Machop 10% · Lv 22 +5 more

   Pick up: TM23 Iron Tail, Hard Stone

8. Route 10

   Wild: Magikarp 100% · Lv 5, Tentacool 100% · Lv 5-40, Horsea 60% · Lv 15-18, Slowpoke 40% · Lv 15-18 +12 more

   Trainers: Hiker Clark Lv 25, Picnicker Heidi Lv 25, Picnicker Carol Lv 26, Hiker Trent Lv 27, Pokémaniac Herman Lv 27, Hiker Trent (Vs. Seeker rematch 1) Lv 36 +5 more

   Pick up: HM05 Flash, Cheri Berry (hidden), Light Ball (hidden), Max Ether (hidden), Nanab Berry (hidden), Persim Berry (hidden), Super Potion (hidden)

9. Route 7

   Wild: Meowth 35% · Lv 25-27, Pidgey 30% · Lv 25, Vulpix 20% · Lv 25-26, Growlithe 10% · Lv 25-27 +2 more

   Pick up: Wepear Berry (hidden)

10. Route 8

    Wild: Meowth 30% · Lv 24, Abra 20% · Lv 20, Pidgey 20% · Lv 24, Growlithe 15% · Lv 24-27 +4 more

    Trainers: Lass Megan Lv 24, Lass Julia Lv 26, Lass Megan (Vs. Seeker rematch 1) Lv 26, Lass Paige Lv 26, Super Nerd Aidan Lv 26, Twins Eli & Anne Lv 26 +12 more

    Pick up: Leppa Berry (hidden), Lum Berry (hidden), Rawst Berry (hidden)

11. Route 9

    Wild: Nidoran♀ 20% · Lv 16, Nidoran♂ 20% · Lv 16, Baltoy 10% · Lv 18, Lickitung 10% · Lv 18 +10 more

    Trainers: Bug Catcher Conner Lv 21, Camper Drew Lv 21, Picnicker Alicia Lv 21, Hiker Brice Lv 22, Bug Catcher Brent Lv 23, Camper Chris Lv 23 +10 more

    Pick up: TM40 Aerial Ace, Burn Heal, Chesto Berry (hidden), Ether (hidden), Rare Candy (hidden)

12. Celadon City Game Corner

    Trainers: Team Rocket Lv 23

13. Rocket Hideout B1F

    Trainers: Team Rocket (4) Lv 24, Team Rocket (1) Lv 25, Team Rocket (3) Lv 25, Team Rocket (5) Lv 25, Team Rocket (2) Lv 26

14. Rocket Hideout B2F

    Trainers: Team Rocket Lv 24

15. Rocket Hideout B3F

    Trainers: Team Rocket (1) Lv 26, Team Rocket (2) Lv 27

16. Rocket Hideout B4F

    Trainers: Team Rocket (1) Lv 27, Team Rocket (2) Lv 27, ★ Boss Giovanni Lv 31, Team Rocket (3) Lv 31, Team Rocket Proton Lv 65

17. Celadon City Gym

    Trainers: Lass Kay Lv 28, Beauty Bridget Lv 29, Cooltrainer Mary Lv 29, Lass Lisa Lv 29, Picnicker Tina Lv 29, Beauty Tamia Lv 30 +6 more

18. Route 10 Pokémon Center 1F

    Trainers: Nurse Joy Lv 63

19. Celadon City Condominiums Roof

    Trainers: Cooltrainer Siker Lv 65

20. Lavender Town

    Trainers: Beauty Karen Lv 65

★ Boss Giovanni — Rocket Hideout B4F

4 Pokémon · level cap Lv 31 (every cap) · Boss Giovanni’s own page

	Pokémon	Ability & item	Moves	Base stats
	Onix Lv 29 RockGround	Ability Rock Head	Dig Rock Tomb Screech Rock Smash	HP75Attack80Defense160Sp. Atk40Sp. Def65Speed90Total510
	Persian Lv 31 Normal	Ability Limber	Slash Cut Water Pulse Thunderbolt	HP65Attack70Defense60Sp. Atk65Sp. Def65Speed115Total440
	Marowak Lv 30 Ground	Ability Rock Head	Bonemerang Cut Rock Smash Take Down	HP65Attack80Defense110Sp. Atk80Sp. Def80Speed45Total460
	Kangaskhan Lv 31 Normal	Ability Early Bird	Fake Out Bite Rock Smash Mega Punch	HP105Attack95Defense80Sp. Atk40Sp. Def80Speed90Total490

★ Erika — Celadon City Gym

4 Pokémon · level cap Lv 35 (every cap) · Erika’s own page

	Pokémon	Ability & item	Moves	Base stats
	Bellossom Lv 33 Grass	Ability Chlorophyll Held item Miracle Seed	Sleep Powder Synthesis Sunny Day Giga Drain	HP90Attack80Defense95Sp. Atk90Sp. Def110Speed50Total515
	Victreebel Lv 34 GrassPoison	Ability Chlorophyll	Stun Spore Sludge Growth Giga Drain	HP80Attack110Defense65Sp. Atk100Sp. Def70Speed75Total500
	Tangela Lv 33 Grass	Ability Thick Fat	Sunny Day Ancient Power Shock Wave Giga Drain	HP80Attack80Defense115Sp. Atk100Sp. Def50Speed60Total485
	Vileplume Lv 35 GrassPoison	Ability Chlorophyll Held item Miracle Seed	Sleep Powder Solar Beam Sunny Day Giga Drain	HP90Attack80Defense95Sp. Atk110Sp. Def90Speed50Total515

★ Erika (once you have beaten Sabrina) — Celadon City Gym

5 Pokémon · level cap Lv 43 (every cap) · Erika (once you have beaten Sabrina)’s own page

	Pokémon	Ability & item	Moves	Base stats
	Bellossom Lv 41 Grass	Ability Chlorophyll	Sleep Powder Synthesis Sunny Day Giga Drain	HP90Attack80Defense95Sp. Atk90Sp. Def110Speed50Total515
	Victreebel Lv 42 GrassPoison	Ability Chlorophyll	Stun Spore Sludge Bomb Growth Giga Drain	HP80Attack110Defense65Sp. Atk100Sp. Def70Speed75Total500
	Tangela Lv 42 Grass	Ability Thick Fat	Sunny Day Ancient Power Shock Wave Giga Drain	HP80Attack80Defense115Sp. Atk100Sp. Def50Speed60Total485
	Exeggutor Lv 41 GrassPsychic	Ability Chlorophyll Held item Quick Claw	Leech Seed Psychic Sleep Powder Giga Drain	HP95Attack95Defense85Sp. Atk125Sp. Def65Speed55Total520
	Vileplume Lv 43 GrassPoison	Ability Chlorophyll Held item Miracle Seed	Sleep Powder Giga Drain Psychic Sludge Bomb	HP90Attack80Defense95Sp. Atk110Sp. Def90Speed50Total515

Also fought around here

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