Part 1: New Bark Town — the start

Professor Elm hands you Chikorita, Cyndaquil or Totodile after the Mystery Egg errand. Route 29 leads toward Cherrygrove; nothing is locked behind a badge yet.

New Bark Town — the start opens 4 areas.

Where to go

1. Elms Lab

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

2. New Bark Town

   Wild: Tentacool 90% · Lv 15-20, Magikarp 85% · Lv 10, Goldeen 70% · Lv 40, Seaking 10% · Lv 40 +1 more

3. Players House 2F

   Wild: Beedrill Lv 50, Cloyster Lv 50, Magmar Lv 50, Magneton Lv 50 +2 more

4. Route 29

   Wild: Hoothoot 55% · Lv 2-3, Pidgey 50% · Lv 2-3, Rattata 45% · Lv 2-3, Sentret 40% · Lv 2-3 +5 more

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

This game's documentation doesn't say where 2 of its 1235 fights happen, so those trainers are on no part of this walkthrough; they are all on the Trainers page.