Pokemon Green Version - Text RPG (English)

A Claude skill that fully recreates Gen 1 Pokemon Green Version as a text-based RPG. (English only)

When to Invoke

This skill is automatically activated when:

• User mentions "pokemon", "pikachu"
• "new game", "continue", "start game" requests
• "battle", "gym", "wild", "pokedex" related conversation

Game Features

• 151 Pokemon: From Bulbasaur to Mew
• 165 Moves: All Gen 1 moves implemented
• 15 Type Chart: Including Gen 1 specific bugs
• Kanto Region: From Pallet Town to Pokemon League
• 8 Gyms: Brock, Misty, Lt. Surge, Erika, Koga, Sabrina, Blaine, Giovanni
• Save/Load: 10 slots + autosave
• BGM Autoplay: 45 tracks (macOS afplay)
• ASCII Art: 151 Pokemon sprites
• Cries: 151 Pokemon cries

Starting the Game

Initialization

pkill -f 'pokemon-green.*bgm' 2>/dev/null

BGM Rules

File path: data/audio/bgm/[filename].mp3

Main BGM Files

Playback Commands

# Stop BGM
pkill -f 'afplay.*pokemon-green' 2>/dev/null

# Play BGM (background loop, required!)
while true; do afplay [skillPath]/data/audio/bgm/[filename].mp3 2>/dev/null || break; done
run_in_background: true

Error Handling

• || break: Prevents infinite loop if file missing
• 2>/dev/null: Hides error messages

New Game / Continue

• "new game" - Start a new adventure
• "continue" - Load saved game

Command System

Field Commands

• north/south/east/west: Move in that direction (e.g., "go north")
• go to [location]: Move to specific location (e.g., "go to Pewter City")
• status / party: Check party Pokemon (e.g., "check status")
• bag: Check inventory (e.g., "open bag")
• pokedex: Pokemon encyclopedia (e.g., "view pokedex")
• save: Save game (e.g., "save")
• talk: Talk to NPC (e.g., "talk")
• NPC: Check NPC info (e.g., "NPC list")

Battle Commands

• fight: Enter move selection mode
• [move name] / [number]: Use a move
• bag: Use item
• pokemon: Switch Pokemon
• run: Flee from wild battle

Audio Commands

• bgm off: Stop BGM
• bgm on: Play BGM
• volume [0-100]: Adjust volume
• cry: Pokemon cry

Move Sound Effects

Sound effect mapping: data/audio/sfx-mapping.json

Game Flow

Opening

1. Prof. Oak greeting
2. Set player name
3. Set rival name

Pallet Town

1. Choose starter at Oak's Lab (Bulbasaur/Charmander/Squirtle)
2. First battle with rival
3. Oak's Parcel delivery quest

Adventure Start

• Route 1 -> Viridian City -> Viridian Forest -> Pewter City (first gym)
• Collect 8 badges -> Victory Road -> Elite Four -> Champion

Battle System

Original Battle Screen (Gen 1 Recreation)

Battle screen is displayed simply like the original. Shows only essential elements without unnecessary tips or extra information.

Sprite Display Rules (Original Recreation):

• Opponent Pokemon: Full 13 lines (right-aligned) - Front view
• My Pokemon: Top 5-6 lines only (left, horizontally flipped) - Back view feel
• pokemon-ascii-mini.json sprites are 13 lines × 28 characters
• My Pokemon: flip horizontally and show only top portion

Battle Screen Layout:

╔════════════════════════════════════════════════════════════════╗
║  Wild Pokemon                                       Lv.5      ║
║  ▓▓▓▓▓▓▓▓▓▓░░░░  HP                                           ║
║                                                                ║
║                                  [Opponent Pokemon Sprite]     ║
║                                  (Full 13 lines - right align) ║
║                                  (Front view)                  ║
║                                                                ║
║  [My Pokemon - Back view]                                      ║
║  (Top 5-6 lines only - left)                                   ║
║  (Horizontally flipped, bottom cut off)                        ║
║                                                                ║
║  Pokemon                                            Lv.5      ║
║  ▓▓▓▓▓▓▓▓▓▓▓▓▓░░  HP  22/22                                   ║
╠════════════════════════════════════════════════════════════════╣
║  A wild Pokemon appeared!                                      ║
╠════════════════════════════════════════════════════════════════╣
║     FIGHT             BAG                                      ║
║     POKEMON           RUN                                      ║
╚════════════════════════════════════════════════════════════════╝

Actual Battle Screen Example:

╔════════════════════════════════════════════════════════════════╗
║  Wild PIKACHU                                       Lv.5      ║
║  ▓▓▓▓▓▓▓▓▓▓░░░░  HP                                           ║
║                                                                ║
║                                          :.            :+=.   ║
║                                        .**.       . .-*#**#-  ║
║                                        -*:    =*+::-+#***+-   ║
║                                    .-*##%#+-:#%#+=+**+*+-     ║
║                                    =%%#########- .=***-.      ║
║                                   =%*#%#*+.:%%#*-   -*#=      ║
║                                   .=*#%%#*++*##%%*..+=:       ║
║                                   .:.:+#*%#+=#%##*+=-:        ║
║                                        :**==+*=+%%#=..        ║
║                                         :+*+++#%#%*:          ║
║                                             .++*%*.           ║
║                                                 :             ║
║                                                                ║
║       :  :                                                     ║
║       ++=*.                                                    ║
║    .-+-+--==..                                                 ║
║ .-+*+==+-=++=++:                                               ║
║ :++==+++++=-+=-=-:..==                                         ║
║ :+=-=+==++--=---:-+**#+                                        ║
║                                                                ║
║  BULBASAUR                                          Lv.5      ║
║  ▓▓▓▓▓▓▓▓▓▓▓▓▓░░  HP  22/22                                   ║
╠════════════════════════════════════════════════════════════════╣
║  A wild PIKACHU appeared!                                      ║
╠════════════════════════════════════════════════════════════════╣
║     FIGHT             BAG                                      ║
║     POKEMON           RUN                                      ║
╚════════════════════════════════════════════════════════════════╝

Message Display Principles (Original Faithful)

What to Display (same as original):

• "A wild [Pokemon] appeared!"
• "[Pokemon] used [Move]!"
• "It's super effective!" or "It's not very effective..."
• "A critical hit!"
• "[Pokemon] fainted!"
• Status condition messages

What NOT to Display (not in original):

• Damage numbers (HP bar decrease only)
• Type effectiveness hints/recommendations
• Move selection tips
• Tactical advice
• AI behavior predictions

ASCII Art Display

• Battle Start: pokemon-ascii.json (full art once)
• During Battle: pokemon-ascii-mini.json (mini art)
• Pokedex: pokemon-ascii.json (full art)

Damage Calculation (Gen 1)

Damage = ((2*Lv/5+2) * Power * A/D / 50 + 2) * STAB * Type * Crit * Random

Gen 1 Bug Recreation

• Psychic vs Ghost: 0x
• Focus Energy: Decreases critical rate
• Poison vs Bug: 2x

NPC System

NPC Sprite Loading Rules

Loading Order (Required!)

1. Convert Korean->English in data/sprites/npc-mapping.json
2. Load data/sprites/npc_ascii/[EnglishName].json file
3. Display .down key ASCII art

jq Loading Example

# Load sprite (cannot load directly with Korean name!)
jq -r '.down | join("\n")' data/sprites/npc_ascii/Professor_Oak.json

Main NPC English Filenames

Error Handling

• File not found: Skip sprite, show dialogue only
• JSON parse fail: Use default text

Dialogue Screen Example

+------------------------------------+
|  [NPC Sprite]                      |
|                                    |
|  Nurse Joy:                        |
|  "Welcome to the Pokemon Center!"  |
+------------------------------------+
|  [1] Yes    [2] No                 |
+------------------------------------+

Save System

Saving

• Manual save: "save" or "save [slot number]"
• Auto save: Pokemon Center, city entry, after battle

Save Slots (10 + autosave)

• save [1-10]: Save to specific slot
• load [1-10]: Load specific slot
• save list: View all slots

Gym Information

1. Pewter City - Brock (Rock) -> Boulder Badge
2. Cerulean City - Misty (Water) -> Cascade Badge
3. Vermilion City - Lt. Surge (Electric) -> Thunder Badge
4. Celadon City - Erika (Grass) -> Rainbow Badge
5. Fuchsia City - Koga (Poison) -> Soul Badge
6. Saffron City - Sabrina (Psychic) -> Marsh Badge
7. Cinnabar Island - Blaine (Fire) -> Volcano Badge
8. Viridian City - Giovanni (Ground) -> Earth Badge

Data File Reference

Pokemon Data

• data/pokemon/species.json: 151 species data
• data/pokemon/learnsets.json: Level-up moves
• data/pokemon/evolutions.json: Evolution conditions

Move/Type Data

• data/moves/moves.json: 165 moves
• data/types/chart.json: 15 type chart

World Data

• data/world/locations.json: Towns/routes
• data/world/encounters.json: Wild encounters
• data/world/trainers.json: Trainers

Audio Data

• data/audio/bgm-mapping.json: 45 BGM mapping
• data/audio/cries-mapping.json: 151 cries

ASCII Art

• data/sprites/pokemon-ascii.json: Full art
• data/sprites/pokemon-ascii-mini.json: Mini art
• data/sprites/npc_ascii/: NPC mini art (94 individual files)
• data/sprites/npc-mapping.json: NPC Korean->filename mapping

Data Key Mapping (Optimized Format)

species.json

n=name, t=types, s=stats[hp,atk,def,spc,spd], c=catchRate, e=baseExp
g=growthRate(ms=medium_slow,mf=medium_fast,s=slow,f=fast), hw=[height,weight]

moves.json

i=id, n=name, t=type, c=category, p=power, a=accuracy, pp=pp, pr=priority, ef=effect
Type codes: N=Normal,F=Fire,W=Water,G=Grass,E=Electric,I=Ice,K=Fighting,P=Poison,R=Ground,Y=Flying,S=Psychic,B=Bug,O=Rock,H=Ghost,D=Dragon
Category: P=Physical, S=Special, X=Status

learnsets.json

lv=levelUp[[level,move]], tm=[number], hm=[number]

encounters.json

g=grass, c=cave, w=water, f=fishing
Format: [[pokemonID, minLv, maxLv, encounterRate]]

trainers.json

n=name, ti=title, g=gym, c=city, ty=type, b=badge, r=reward, tm=tmReward
o=order, d=dialogue, p=team[[id,lv,[moves]]], cl=class
gl=gymLeaders, e4=eliteFour, ch=champion, rt=routeTrainers

items.json

n=name, d=desc, p=price, cm=catchMod, ha=heal, c=cures, ra=revive
ppr=ppRestore, am=allMoves, sb=statBoost, ef=effect, st=steps, et=evoType
Categories: pb=pokeballs, pt=potions, sh=statusHealers, rv=revives, pp=ppItems
bt=battleItems, rp=repels, es=escapeItems, ev=evolutionStones, vi=vitamins

Data Loading

Extract only needed parts with jq (don't load entire large files)

jq '.["25"]' data/pokemon/species.json      # Species data
jq '.["025"]' data/sprites/pokemon-ascii.json  # Sprite (3 digits)

Key formats:

• species, learnsets: number key ("25")
• sprites: 3-digit key ("025")

References (Detailed Guides)

For detailed system information, refer to these documents:

• BGM System Guide (references/bgm-guide.md) - BGM autoplay, commands, event mapping
• Move SFX Guide (references/sfx-guide.md) - Move sound effects, download method
• ASCII Art Guide (references/ascii-guide.md) - ASCII art usage rules, data files
• NPC System Guide (references/npc-guide.md) - NPC sprite display, name mapping
• Cries Guide (references/cries-guide.md) - Cry playback timing, commands
• Data Integrity Guide (references/data-integrity.md) - Data validation rules, checklist

Language Settings

This skill is English only.

For Korean version, use the separate skill pokemon-green-ko.

Data File Structure

All names/messages are stored in single language format:

{
  "name": "Bulbasaur",
  "text": "A wild Pokemon appeared!"
}

Message files:

• data/messages/battle.json - Battle messages

Help

Use these commands anytime during the game:

• "help" - Command list
• "location" - Current location info
• "progress" - Story progress