Pokemon Battle Simulator Napkin Challenge!

A developer used Google's Gemini 3.5 Flash AI to build a complete Pokemon Battle Simulator from a single system architecture image. The AI generated the entire project, including an API client with local caching, a move registry with STAB priority, a battle SDK with level scaling, and a CLI shell supporting team selection and battle commands.

▄▀▀▄ Antigravity CLI 1.0.2 ▀▀▀▀▀▀ xbill9@gmail.com Google AI Ultra ▀▀▀▀▀▀▀▀ Gemini 3.5 Flash Medium ▄▀▀ ▀▀▄ ~/pokemon ▄▀▀ ▀▀▄ ──────────────────────────────────────────────────────────── use @pokemon api.jpg as the system architecture and build out a pokemon battle simulator ● ListDir /home/xbill/pokemon ● Read /home/xbill/pokemon/pokemon api.jpg ctrl+o to expand ▸ Thought for 7s, 852 tokens Observing the Image ● Bash node -v && npm -v && python3 --version ctrl+o to expand ▸ Thought for 6s, 2.5k tokens Considering Language Choice ● Create /home/xbill/.gemini/antigravity-cli/brain/42...abf-b329-894a07ec5075/implementation plan.md ctrl+o to expand I have created the implementation plan for the Pokemon Battle Simulator matching the architecture in the diagram. Please review the implementation plan.md and let me know if you approve or if you'd like any modifications before I begin building the simulator. ──────────────────────────────────────────────────────────── yes i approve ▸ Thought for 6s, 304 tokens Initiating Execution Phase ● Create /home/xbill/.gemini/antigravity-cli/brain/42560c5f-0aec-4abf-b329-894a07ec5075/task.md ● Create /home/xbill/pokemon/package.json ● Edit /home/xbill/.gemini/antigravity-cli/brain/42560c5f-0aec-4abf-b329-894a07ec5075/task.md ctrl+o to expand ▸ Thought for 7s, 364 tokens Defining API Layer ● Create /home/xbill/pokemon/src/api/pokeApi.js ● Edit /home/xbill/.gemini/antigravity-cli/brain/42560c5f-0aec-4abf-b329-894a07ec5075/task.md ctrl+o to expand ▸ Thought for 7s, 1.4k tokens Defining Move Database ● Create /home/xbill/pokemon/src/api/moveDatabase.js ● Edit /home/xbill/.gemini/antigravity-cli/brain/42560c5f-0aec-4abf-b329-894a07ec5075/task.md ctrl+o to expand ▸ Thought for 7s, 2.6k tokens Defining Battle SDK Logic ● Create /home/xbill/pokemon/src/sdk/battleSdk.js ● Edit /home/xbill/.gemini/antigravity-cli/brain/42560c5f-0aec-4abf-b329-894a07ec5075/task.md ctrl+o to expand ▸ Thought for 1s, 373 tokens Designing Color Utility ● Create /home/xbill/pokemon/src/utils/colors.js ● Edit /home/xbill/.gemini/antigravity-cli/brain/42560c5f-0aec-4abf-b329-894a07ec5075/task.md ctrl+o to expand ▸ Thought for 6s, 1.3k tokens Constructing the CLI Router ● Create /home/xbill/pokemon/src/cli/index.js ● Edit /home/xbill/.gemini/antigravity-cli/brain/42560c5f-0aec-4abf-b329-894a07ec5075/task.md ● Create /home/xbill/pokemon/index.js ● Edit /home/xbill/.gemini/antigravity-cli/brain/42560c5f-0aec-4abf-b329-894a07ec5075/task.md ctrl+o to expand ▸ Thought for 8s, 228 tokens Defining Test Runner Goals ● Create /home/xbill/pokemon/src/utils/test runner.js ● Bash node src/utils/test runner.js ● Edit /home/xbill/.gemini/antigravity-cli/brain/42560c5f-0aec-4abf-b329-894a07ec5075/task.md ctrl+o to expand ▸ Thought for 8s, 142 tokens Drafting Walkthrough Documentation ● Create /home/xbill/.gemini/antigravity-cli/brain/42560c5f-0aec-4abf-b329-894a07ec5075/walkthrough.md ● Edit /home/xbill/.gemini/antigravity-cli/brain/42560c5f-0aec-4abf-b329-894a07ec5075/task.md ctrl+o to expand ▸ Thought for 5s, 517 tokens I have built out the Pokemon Battle Simulator matching the system architecture diagram in @pokemon api.jpg . Here is a summary of the components created: • API Client pokeApi.js : Connects to PokeAPI with local filesystem caching. Verifying Project Completion • Move Registry moveDatabase.js : Predefined type databases and dynamic move generator prioritizing STAB. • Gameplay SDK battleSdk.js : Performs combat math, turn ordering, level scaling Lv. 50 for team, Lv. 100 with 3x HP for Bosses , and state execution. • Color & Formatter colors.js : Standard ANSI coloring, dynamic health bar drawing, and typewriter-style delayed text printing. • CLI Shell & Entry Point index.js & index.js : Command router supporting /pick team , /stats , /run battle , /help , and /exit . Playing the Simulator To launch the game: node index.js For full details on the codebase and how features were tested, please refer to the walkthrough.md. ──────────────────────────────────────────────────────────── node index.js ▸ Thought for 5s, 420 tokens Considering Interactive CLI Commands ● Bash node index.js ● ManageTask Task: 42560c5f-0aec-4abf-b329-894a07ec5075/task-56 ctrl+o to expand The simulator has successfully started and is running in the background: ╔════════════════════════════╗ ║ POKEMON BATTLE SIMULATOR ║ ╚════════════════════════════╝ Welcome, Trainer Prepare for epic battles. Type /help to see available commands. poke-sim You can interact with it by typing commands directly. If you want me to input a command for you, just tell me what to type e.g. /help , /pick team pikachu charizard , or /run battle The simulator is ready and waiting at the poke-sim prompt. Let me know if you would like me to send a command to the process, or if you would like to run it directly in your own terminal. ──────────────────────────────────────────────────────────── /pick team squirtle mew lucario ● ManageTask Input sent to task "42560c5f-0aec-4abf-b329-894a07ec5075/task-56". ● ManageTask Task: 42560c5f-0aec-4abf-b329-894a07ec5075/task-56 ctrl+o to expand The team has been successfully selected: • Squirtle • Mew • Lucario The simulator is ready for your next command e.g. /stats or /run battle . The team is loaded What would you like to do next? You can check their stats with /stats or initiate the battle with /run battle . ──────────────────────────────────────────────────────────── /run battle ● ManageTask Input sent to task "42560c5f-0aec-4abf-b329-894a07ec5075/task-56". ● ManageTask Task: 42560c5f-0aec-4abf-b329-894a07ec5075/task-56 ctrl+o to expand The simulator is asking you to choose a Boss Pokemon to face: Choose a Boss Pokemon Default: Mewtwo : Which Pokemon would you like to battle? Or press Enter to face Mewtwo . ──────────────────────────────────────────────────────────── mewtwo ● ManageTask Input sent to task "42560c5f-0aec-4abf-b329-894a07ec5075/task-56". ● ManageTask Task: 42560c5f-0aec-4abf-b329-894a07ec5075/task-56 ● ManageTask Input sent to task "42560c5f-0aec-4abf-b329-894a07ec5075/task-56". ● ManageTask Task: 42560c5f-0aec-4abf-b329-894a07ec5075/task-56 ctrl+o to expand The battle has begun Here is the current field state: ════════════════════════════════════════════════════════════ ⚡ BOSS MEWTWO Lv. 100 Type: PSYCHIC HP: █████████████████████████ 1011/1011 ──────────────────────────────────────────────────────────── 🟢 YOUR SQUIRTLE Lv. 50 Type: WATER HP: █████████████████████████ 111/111 ════════════════════════════════════════════════════════════ What will Squirtle do? 1 Hydro Pump WATER Power: 110 Spec 2 Surf WATER Power: 90 Spec 3 Waterfall WATER Power: 80 Phys 4 Tera Blast FIRE Power: 110 Spec 5 Switch Pokemon 6 Run Away Select an action 1-6 : Please choose a move 1-4 , switch Pokemon 5 , or run 6 . ──────────────────────────────────────────────────────────── 1 ● ManageTask Input sent to task "42560c5f-0aec-4abf-b329-894a07ec5075/task-56". ● ManageTask Task: 42560c5f-0aec-4abf-b329-894a07ec5075/task-56 ctrl+o to expand Oh no Mewtwo was too fast: • Mewtwo used Psychic Dealt 465 damage. • Squirtle fainted You are forced to send out your next Pokemon. Here are your remaining members: You must send out another Pokemon Choose a Pokemon: 1 Squirtle Lv. 50 - FAINTED Active 2 Mew Lv. 50 - HP: 167/167 3 Lucario Lv. 50 - HP: 137/137 Please choose either 2 Mew or 3 Lucario : Please choose 2 for Mew or 3 for Lucario. ──────────────────────────────────────────────────────────── 2 ● ManageTask Input sent to task "42560c5f-0aec-4abf-b329-894a07ec5075/task-56". ● ManageTask Task: 42560c5f-0aec-4abf-b329-894a07ec5075/task-56 ● ManageTask Input sent to task "42560c5f-0aec-4abf-b329-894a07ec5075/task-56". ● ManageTask Task: 42560c5f-0aec-4abf-b329-894a07ec5075/task-56 ctrl+o to expand Mew is now on the field: ════════════════════════════════════════════════════════════ ⚡ BOSS MEWTWO Lv. 100 Type: PSYCHIC HP: █████████████████████████ 1011/1011 ──────────────────────────────────────────────────────────── 🟢 YOUR MEW Lv. 50 Type: PSYCHIC HP: █████████████████████████ 167/167 ════════════════════════════════════════════════════════════ What will Mew do? 1 Psychic PSYCHIC Power: 90 Spec 2 Zen Headbutt PSYCHIC Power: 80 Phys 3 Psybeam PSYCHIC Power: 65 Spec 4 Thunder Punch FIRE Power: 110 Phys 5 Switch Pokemon 6 Run Away Select option 1-6 : Please select an action from 1 to 6. ──────────────────────────────────────────────────────────── 3 ● ManageTask Input sent to task "42560c5f-0aec-4abf-b329-894a07ec5075/task-56". ● ManageTask Task: 42560c5f-0aec-4abf-b329-894a07ec5075/task-56 ctrl+o to expand Mewtwo is incredibly powerful and fast • Mewtwo went first and used Thunder Punch Dealt 195 damage. • Mew fainted You only have Lucario left: Choose a Pokemon: 1 Squirtle Lv. 50 - FAINTED 2 Mew Lv. 50 - FAINTED Active 3 Lucario Lv. 50 - HP: 137/137 Please select 3 Lucario to send it out: Please select 3 to send out Lucario. ──────────────────────────────────────────────────────────── 3 ● ManageTask Input sent to task "42560c5f-0aec-4abf-b329-894a07ec5075/task-56". ● ManageTask Task: 42560c5f-0aec-4abf-b329-894a07ec5075/task-56 ● ManageTask Input sent to task "42560c5f-0aec-4abf-b329-894a07ec5075/task-56". ● ManageTask Task: 42560c5f-0aec-4abf-b329-894a07ec5075/task-56 ctrl+o to expand Lucario is now on the field ════════════════════════════════════════════════════════════ ⚡ BOSS MEWTWO Lv. 100 Type: PSYCHIC HP: █████████████████████████ 1011/1011 ──────────────────────────────────────────────────────────── 🟢 YOUR LUCARIO Lv. 50 Type: FIGHT STEEL HP: █████████████████████████ 137/137 ════════════════════════════════════════════════════════════ What will Lucario do? 1 Close Combat FIGHT Power: 120 Phys 2 Aura Sphere FIGHT Power: 80 Spec 3 Flash Cannon STEEL Power: 80 Spec 4 Thunder Punch FIRE Power: 110 Phys 5 Switch Pokemon 6 Run Away Select option 1-6 : Please select an option from 1 to 6. ──────────────────────────────────────────────────────────── 4 ● ManageTask Input sent to task "42560c5f-0aec-4abf-b329-894a07ec5075/task-56". ● ManageTask Task: 42560c5f-0aec-4abf-b329-894a07ec5075/task-56 ● ManageTask Input sent to task "42560c5f-0aec-4abf-b329-894a07ec5075/task-56". ● ManageTask Task: 42560c5f-0aec-4abf-b329-894a07ec5075/task-56 ● ManageTask Input sent to task "42560c5f-0aec-4abf-b329-894a07ec5075/task-56". ● ManageTask Task: 42560c5f-0aec-4abf-b329-894a07ec5075/task-56 ctrl+o to expand Mewtwo was a bit too powerful for our team • Mewtwo went first and used Thunder Punch Fire-type move Dealt 520 damage. • Lucario fainted Since all your Pokemon fainted, you were defeated: ╔══════════╗ ║ DEFEAT ║ ╚══════════╝ 💀 All your Pokemon fainted. Boss Mewtwo wins. The game has successfully returned to the main lobby shell: poke-sim You can now: What would you like to do next? You can try modifying your team, fighting another boss, or typing /exit to close the simulator.