Badge 1: Brock (FireRed / LeafGreen)

1 Pallet Town: Prof. Oak and the starter

Tiles (12, 1) and (13, 1) in Pallet Town start Prof. Oak's scene while VAR_MAP_SCENE_PALLET_TOWN_OAK is 0: he stops the player and takes them to his lab. The three Poké Balls are at (8, 4), (9, 4) and (10, 4); the rival takes the one that is strong against yours (Charmander against Bulbasaur). Taking a Poké Ball sets FLAG_SYS_POKEMON_GET. On the way out, tiles (5..7, 8) start the rival battle (VAR_MAP_SCENE_PALLET_TOWN_PROFESSOR_OAKS_LAB goes from 2 to 3).

▶ From the bedroom to Pallet Town's north exit 19 steps
Pallet Town — Players House 2F → Pallet Town — Players House 1F → Pallet Town
▶ Toward Route 1: Prof. Oak stops the player 14 steps
Pallet Town
▶ To the Poké Balls 9 steps
Pallet Town — Professor Oaks Lab
▶ Toward the exit: the rival 5 steps
Pallet Town — Professor Oaks Lab
📍 Prof. Oak (Pallet Town)
⚔ The rival (in the lab) (Pallet Town — Professor Oaks Lab)

Source : PalletTown/scripts.inc, PalletTown_ProfessorOaksLab/scripts.inc · blocages § 5.1

2 Viridian City: Oak's Parcel

At the Viridian Mart door, ViridianCity_Mart_EventScript_ParcelScene (VAR_MAP_SCENE_VIRIDIAN_CITY_MART at 0) gives Oak's Parcel (ITEM_OAKS_PARCEL). Until then the old man lying at (21, 11) blocks Route 2: VAR_MAP_SCENE_VIRIDIAN_CITY_OLD_MAN stays 0 until the Pokédex is handed over.

▶ Route 1 to Viridian City 81 steps
Pallet Town — Professor Oaks Lab → Pallet Town → Route 1 → Viridian City
▶ To the Mart: Oak's Parcel 37 steps
Viridian City → Viridian City — Poké Mart

Source : ViridianCity_Mart/scripts.inc, ViridianCity/scripts.inc · blocages § 5.2

3 Back to the lab: the Pokédex

Handing over the parcel (PalletTown_ProfessorOaksLab_EventScript_ReceiveDexScene) gives the Pokédex (FLAG_SYS_POKEDEX_GET) and frees the Viridian old man (VAR_MAP_SCENE_VIRIDIAN_CITY_OLD_MAN becomes 1). The rival leaves the lab.

▶ Back to Pallet Town: deliver the parcel 100 steps · 5 jump(s)
Viridian City — Poké Mart → Viridian City → Route 1 → Pallet Town → Pallet Town — Professor Oaks Lab

Source : PalletTown_ProfessorOaksLab/scripts.inc (ReceiveDexScene)

4 Route 2, Viridian Forest, Pewter City

Route 2 north, Viridian Forest (four bug catchers; the tiles where they see the player are marked), then Route 2's north exit to Pewter City. Route 2's cut trees need Cut, so this route avoids them.

▶ Viridian City, Route 2, forest entrance 180 steps
Pallet Town — Professor Oaks Lab → Pallet Town → Route 1 → Viridian City → Route 2 → Route 2 — Viridian Forest South Entrance → Viridian Forest
▶ Across Viridian Forest to Pewter City 164 steps · ! 1 trainer(s) watching
Viridian Forest → Route 2 — Viridian Forest North Entrance → Route 2 → Pewter City

Source : Route2/map.json, ViridianForest/scripts.inc

5 The Gym — badge 1

Only one trainer before Brock. After the battle FLAG_DEFEATED_BROCK and FLAG_BADGE01_GET are set and VAR_MAP_SCENE_PEWTER_CITY becomes 1: Pewter's east exit, which sent the player back to the Gym, opens.

▶ To the Gym 56 steps
Pewter City → Pewter City — Gym
📍 Liam (Pewter City — Gym)
⚔ Brock (Pewter City — Gym)

Team — Brock

• Geodude Lv. 12
• Onix Lv. 14

Prize money : 1400 ₽

Rewards

• TM39
• Badge 1 : Flash usable outside battle ; Attack +10%.

Source : src/party_menu.c, src/pokemon.c, src/battle_main.c, src/battle_util.c (IsMonDisobedient)

Source : PewterCity_Gym/scripts.inc (DefeatedBrock) · blocages § 5.4