Part 1: Just started — no badges

Just started — no badges opens 7 areas. There are 12 trainers standing in them. The fights at this checkpoint are Rival Blue (Bulbasaur), Rival Blue (Charmander), Rival Blue (Squirtle).

Where to go

1. Route 1

   Wild: Pidgey 50% · Lv 2-5, Rattata 50% · Lv 2-4

2. Route 2

   Wild: Pidgey 45% · Lv 3-5, Rattata 40% · Lv 2-5, Caterpie 15% · Lv 3-5, Weedle 15% · Lv 3-5 +1 more

3. Route 22

   Wild: Magikarp 100% · Lv 5, Goldeen 50% · Lv 10, Poliwag 50% · Lv 10, Rattata 45% · Lv 2-4 +3 more

   Trainers: ★ Rival Blue (Bulbasaur) Lv 9, ★ Rival Blue (Bulbasaur) Lv 53, ★ Rival Blue (Charmander) Lv 9, ★ Rival Blue (Charmander) Lv 53, ★ Rival Blue (Squirtle) Lv 9, ★ Rival Blue (Squirtle) Lv 53

4. Viridian Forest

   Wild: Caterpie 45% · Lv 3-5, Weedle 45% · Lv 3-5, Kakuna 40% · Lv 4-6, Metapod 40% · Lv 4-6 +1 more

   Trainers: Bug Catcher Lv 6, Bug Catcher #2 Lv 7, Bug Catcher #3 Lv 9

5. Pallet Town

   Wild: Magikarp 100% · Lv 5, Goldeen 50% · Lv 10, Poliwag 50% · Lv 10, Tentacool 50% · Lv 15 +3 more

6. Viridian City

   Wild: Magikarp 100% · Lv 5, Goldeen 50% · Lv 10, Poliwag 50% · Lv 10, Tentacool 50% · Lv 15

   Pick up: TM27 Fissure, TM42 Dream Eater

7. Oak's Lab

   Trainers: ★ Rival Blue (Bulbasaur) Lv 5, ★ Rival Blue (Charmander) Lv 5, ★ Rival Blue (Squirtle) Lv 5

★ Rival Blue (Bulbasaur) — Oak's Lab

1 Pokémon · level cap Lv 5 (every cap) · Rival Blue (Bulbasaur)’s own page

	Pokémon	Ability & item	Moves	Base stats
	Bulbasaur Lv 5 GrassPoison		Tackle Growl	HP45Attack49Defense49Sp. Atk65Sp. Def65Speed45Total318

★ Rival Blue (Charmander) — Oak's Lab

1 Pokémon · level cap Lv 5 (every cap) · Rival Blue (Charmander)’s own page

	Pokémon	Ability & item	Moves	Base stats
	Charmander Lv 5 Fire		Scratch Growl	HP39Attack52Defense43Sp. Atk60Sp. Def50Speed65Total309

★ Rival Blue (Squirtle) — Oak's Lab

1 Pokémon · level cap Lv 5 (every cap) · Rival Blue (Squirtle)’s own page

	Pokémon	Ability & item	Moves	Base stats
	Squirtle Lv 5 Water		Tackle Tail Whip	HP44Attack48Defense65Sp. Atk50Sp. Def64Speed43Total314

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

It also doesn't say when Kanto Underground Path opens up, so it is in no part above; it has its own route page.