dev-jelly-pokemon-skills

Pokemon Green Text RPG

Claude Code Skill for Generation 1

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A Claude Code skill that lets you play Generation 1 Pokemon Green Version as a text-based RPG in your terminal.

Why Did I Make This?

Nostalgia

1996. The first Pokemon game on a Game Boy screen. I wanted to relive that excitement in the terminal.

Experiment

The real purpose of this project is an experiment: "How deterministically can we control a non-deterministic LLM through skills?"

• LLMs are inherently non-deterministic. Same input, different outputs.
• But what if we provide enough structured data and explicit rules?
• Can skills (SKILL.md) as constraints make AI behavior predictable?

Through Claude Code's skill system, we explore the possibility of "taming AI with structured data."

Demo

Game Start Screen

╔══════════════════════════════════════════════════════════════════╗
║                                                                  ║
║                    POKEMON GREEN VERSION                         ║
║                                                                  ║
║    ░█▀█░█▀█░█░█░█▀▀░█▄█░█▀█░█▀█                                 ║
║    ░█▀▀░█░█░█▀▄░█▀▀░█░█░█░█░█░█                                 ║
║    ░▀░░░▀▀▀░▀░▀░▀▀▀░▀░▀░▀▀▀░▀░▀                                 ║
║                                                                  ║
║                    ♪ Opening BGM Playing...                      ║
║                                                                  ║
║              ┌─────────────────────────────────┐                 ║
║              │                                 │                 ║
║              │      [1] New Game               │                 ║
║              │      [2] Continue               │                 ║
║              │                                 │                 ║
║              └─────────────────────────────────┘                 ║
║                                                                  ║
╚══════════════════════════════════════════════════════════════════╝

Prof. Oak Intro

╔══════════════════════════════════════════════════════════════════╗
║                                                                  ║
║               @@@@@@@@@          @@@@@@@@@                       ║
║               @@@@     **********  @@@@@@@                       ║
║               @@@@@  **   **     **  @@@@@                       ║
║               @@@@@    ***  *****    @@@@@                       ║
║               @@@@   **************    @@@                       ║
║               @@  *  **--*******-**  ** @@                       ║
║               @@  ******* ----  ******* @@                       ║
║               @@  *--**** ****  ***--** @@                       ║
║               @@   **  ***----***  **   @@                       ║
║                 ***  **          **  ***                         ║
║                 ***  ****       ***  ***                         ║
║               @@     **** ----  ***     @@                       ║
║               @@@@ ******       *****  @@@                       ║
║               @@@@@                  @@@@@                       ║
║               @@@@        @@@@         @@@                       ║
║                                                                  ║
║   ┌────────────────────────────────────────────────────────┐     ║
║   │                                                        │     ║
║   │  Prof. Oak:                                            │     ║
║   │  "Hello there! Welcome to the world of Pokemon!"       │     ║
║   │  "My name is Oak."                                     │     ║
║   │  "People call me the Pokemon Professor."               │     ║
║   │                                                        │     ║
║   └────────────────────────────────────────────────────────┘     ║
║                                                                  ║
╚══════════════════════════════════════════════════════════════════╝

Battle Screen