{"slug": "pokemon-battle-simulator-napkin-challenge", "title": "Pokemon Battle Simulator Napkin Challenge!", "summary": "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.", "body_md": "\n\n```\n  ▄▀▀▄        Antigravity CLI 1.0.2\n ▀▀▀▀▀▀       xbill9@gmail.com (Google AI Ultra)\n▀▀▀▀▀▀▀▀      Gemini 3.5 Flash (Medium)\n```\n\n▄▀▀ ▀▀▄ ~/pokemon\n\n▄▀▀ ▀▀▄\n\n────────────────────────────────────────────────────────────\n\nuse @pokemon_api.jpg as the system architecture and build out a pokemon battle simulator\n\n● ListDir(/home/xbill/pokemon)\n\n● Read(/home/xbill/pokemon/pokemon_api.jpg) (ctrl+o to expand)\n\n▸ Thought for 7s, 852 tokens\n\nObserving the Image\n\n● Bash(node -v && npm -v && python3 --version) (ctrl+o to expand)\n\n▸ Thought for 6s, 2.5k tokens\n\nConsidering Language Choice\n\n● Create(/home/xbill/.gemini/antigravity-cli/brain/42...abf-b329-894a07ec5075/implementation_plan.md) (ctrl+o to expand)\n\nI have created the implementation plan for the Pokemon Battle Simulator matching the architecture in the diagram.\n\nPlease review the implementation_plan.md and let me know if you approve or if you'd like any modifications before I\n\nbegin\n\nbuilding the simulator.\n\n────────────────────────────────────────────────────────────\n\nyes i approve\n\n▸ Thought for 6s, 304 tokens\n\nInitiating Execution Phase\n\n● Create(/home/xbill/.gemini/antigravity-cli/brain/42560c5f-0aec-4abf-b329-894a07ec5075/task.md)\n\n● Create(/home/xbill/pokemon/package.json)\n\n● Edit(/home/xbill/.gemini/antigravity-cli/brain/42560c5f-0aec-4abf-b329-894a07ec5075/task.md) (ctrl+o to expand)\n\n▸ Thought for 7s, 364 tokens\n\nDefining API Layer\n\n● Create(/home/xbill/pokemon/src/api/pokeApi.js)\n\n● Edit(/home/xbill/.gemini/antigravity-cli/brain/42560c5f-0aec-4abf-b329-894a07ec5075/task.md) (ctrl+o to expand)\n\n▸ Thought for 7s, 1.4k tokens\n\nDefining Move Database\n\n● Create(/home/xbill/pokemon/src/api/moveDatabase.js)\n\n● Edit(/home/xbill/.gemini/antigravity-cli/brain/42560c5f-0aec-4abf-b329-894a07ec5075/task.md) (ctrl+o to expand)\n\n▸ Thought for 7s, 2.6k tokens\n\nDefining Battle SDK Logic\n\n● Create(/home/xbill/pokemon/src/sdk/battleSdk.js)\n\n● Edit(/home/xbill/.gemini/antigravity-cli/brain/42560c5f-0aec-4abf-b329-894a07ec5075/task.md) (ctrl+o to expand)\n\n▸ Thought for 1s, 373 tokens\n\nDesigning Color Utility\n\n● Create(/home/xbill/pokemon/src/utils/colors.js)\n\n● Edit(/home/xbill/.gemini/antigravity-cli/brain/42560c5f-0aec-4abf-b329-894a07ec5075/task.md) (ctrl+o to expand)\n\n▸ Thought for 6s, 1.3k tokens\n\nConstructing the CLI Router\n\n● Create(/home/xbill/pokemon/src/cli/index.js)\n\n● Edit(/home/xbill/.gemini/antigravity-cli/brain/42560c5f-0aec-4abf-b329-894a07ec5075/task.md)\n\n● Create(/home/xbill/pokemon/index.js)\n\n● Edit(/home/xbill/.gemini/antigravity-cli/brain/42560c5f-0aec-4abf-b329-894a07ec5075/task.md) (ctrl+o to expand)\n\n▸ Thought for 8s, 228 tokens\n\nDefining Test Runner Goals\n\n● Create(/home/xbill/pokemon/src/utils/test_runner.js)\n\n● Bash(node src/utils/test_runner.js)\n\n● Edit(/home/xbill/.gemini/antigravity-cli/brain/42560c5f-0aec-4abf-b329-894a07ec5075/task.md) (ctrl+o to expand)\n\n▸ Thought for 8s, 142 tokens\n\nDrafting Walkthrough Documentation\n\n● Create(/home/xbill/.gemini/antigravity-cli/brain/42560c5f-0aec-4abf-b329-894a07ec5075/walkthrough.md)\n\n● Edit(/home/xbill/.gemini/antigravity-cli/brain/42560c5f-0aec-4abf-b329-894a07ec5075/task.md) (ctrl+o to expand)\n\n▸ Thought for 5s, 517 tokens\n\nI have built out the Pokemon Battle Simulator matching the system architecture diagram in @pokemon_api.jpg .\n\nHere is a summary of the components created:\n\n• API Client (pokeApi.js): Connects to PokeAPI with local filesystem caching.\n\nVerifying Project Completion\n\n• Move Registry (moveDatabase.js): Predefined type databases and dynamic move generator prioritizing STAB.\n\n• Gameplay SDK (battleSdk.js): Performs combat math, turn ordering, level scaling (Lv. 50 for team, Lv. 100 with 3x\n\nHP for Bosses), and state execution.\n\n• Color & Formatter (colors.js): Standard ANSI coloring, dynamic health bar drawing, and typewriter-style\n\ndelayed text printing.\n\n• CLI Shell & Entry Point (index.js & index.js): Command router supporting /pick team , /stats , /run\n\nbattle , /help , and /exit .\n\n### Playing the Simulator\n\nTo launch the game:\n\n```\nnode index.js\n```\n\nFor full details on the codebase and how features were tested, please refer to the walkthrough.md.\n\n────────────────────────────────────────────────────────────\n\nnode index.js\n\n▸ Thought for 5s, 420 tokens\n\nConsidering Interactive CLI Commands\n\n● Bash(node index.js)\n\n● ManageTask(Task: 42560c5f-0aec-4abf-b329-894a07ec5075/task-56) (ctrl+o to expand)\n\nThe simulator has successfully started and is running in the background:\n\n```\n╔════════════════════════════╗\n║  POKEMON BATTLE SIMULATOR  ║\n╚════════════════════════════╝\nWelcome, Trainer! Prepare for epic battles.\nType /help to see available commands.\n\npoke-sim>\n```\n\nYou can interact with it by typing commands directly. If you want me to input a command for you, just tell me what to\n\ntype (e.g. /help , /pick team pikachu charizard , or /run battle )!\n\nThe simulator is ready and waiting at the poke-sim> prompt. Let me know if you would like me to send a command to\n\nthe process, or if you would like to run it directly in your own terminal.\n\n────────────────────────────────────────────────────────────\n\n/pick team squirtle mew lucario\n\n● ManageTask(Input sent to task \"42560c5f-0aec-4abf-b329-894a07ec5075/task-56\".)\n\n● ManageTask(Task: 42560c5f-0aec-4abf-b329-894a07ec5075/task-56) (ctrl+o to expand)\n\nThe team has been successfully selected:\n\n• Squirtle\n\n• Mew\n\n• Lucario\n\nThe simulator is ready for your next command (e.g. /stats or /run battle ).\n\nThe team is loaded! What would you like to do next? You can check their stats with /stats or initiate the battle\n\nwith /run battle .\n\n────────────────────────────────────────────────────────────\n\n/run battle\n\n● ManageTask(Input sent to task \"42560c5f-0aec-4abf-b329-894a07ec5075/task-56\".)\n\n● ManageTask(Task: 42560c5f-0aec-4abf-b329-894a07ec5075/task-56) (ctrl+o to expand)\n\nThe simulator is asking you to choose a Boss Pokemon to face:\n\n```\nChoose a Boss Pokemon (Default: Mewtwo):\n```\n\nWhich Pokemon would you like to battle? (Or press Enter to face Mewtwo).\n\n────────────────────────────────────────────────────────────\n\nmewtwo\n\n● ManageTask(Input sent to task \"42560c5f-0aec-4abf-b329-894a07ec5075/task-56\".)\n\n● ManageTask(Task: 42560c5f-0aec-4abf-b329-894a07ec5075/task-56)\n\n● ManageTask(Input sent to task \"42560c5f-0aec-4abf-b329-894a07ec5075/task-56\".)\n\n● ManageTask(Task: 42560c5f-0aec-4abf-b329-894a07ec5075/task-56) (ctrl+o to expand)\n\nThe battle has begun! Here is the current field state:\n\n```\n════════════════════════════════════════════════════════════\n⚡ BOSS MEWTWO [Lv. 100]\nType:  PSYCHIC\nHP:   [█████████████████████████] 1011/1011\n────────────────────────────────────────────────────────────\n🟢 YOUR SQUIRTLE [Lv. 50]\nType:  WATER\nHP:   [█████████████████████████]   111/111\n════════════════════════════════════════════════════════════\n\nWhat will Squirtle do?\n  1) Hydro Pump [ WATER ] Power: 110 (Spec)\n  2) Surf [ WATER ] Power: 90 (Spec)\n  3) Waterfall [ WATER ] Power: 80 (Phys)\n  4) Tera Blast [ FIRE ] Power: 110 (Spec)\n  5) Switch Pokemon\n  6) Run Away\n```\n\nSelect an action (1-6):\n\nPlease choose a move (1-4), switch Pokemon (5), or run (6).\n\n────────────────────────────────────────────────────────────\n\n1\n\n● ManageTask(Input sent to task \"42560c5f-0aec-4abf-b329-894a07ec5075/task-56\".)\n\n● ManageTask(Task: 42560c5f-0aec-4abf-b329-894a07ec5075/task-56) (ctrl+o to expand)\n\nOh no! Mewtwo was too fast:\n\n• Mewtwo used Psychic! Dealt 465 damage.\n\n• Squirtle fainted!\n\nYou are forced to send out your next Pokemon. Here are your remaining members:\n\nYou must send out another Pokemon!\n\nChoose a Pokemon:\n\n1) Squirtle [Lv. 50] - FAINTED (Active)\n\n2) Mew [Lv. 50] - HP: 167/167\n\n3) Lucario [Lv. 50] - HP: 137/137\n\nPlease choose either 2 (Mew) or 3 (Lucario):\n\nPlease choose 2 for Mew or 3 for Lucario.\n\n────────────────────────────────────────────────────────────\n\n2\n\n● ManageTask(Input sent to task \"42560c5f-0aec-4abf-b329-894a07ec5075/task-56\".)\n\n● ManageTask(Task: 42560c5f-0aec-4abf-b329-894a07ec5075/task-56)\n\n● ManageTask(Input sent to task \"42560c5f-0aec-4abf-b329-894a07ec5075/task-56\".)\n\n● ManageTask(Task: 42560c5f-0aec-4abf-b329-894a07ec5075/task-56) (ctrl+o to expand)\n\nMew is now on the field:\n\n```\n════════════════════════════════════════════════════════════\n⚡ BOSS MEWTWO [Lv. 100]\nType:  PSYCHIC\nHP:   [█████████████████████████] 1011/1011\n────────────────────────────────────────────────────────────\n🟢 YOUR MEW [Lv. 50]\nType:  PSYCHIC\nHP:   [█████████████████████████]   167/167\n════════════════════════════════════════════════════════════\n\nWhat will Mew do?\n  1) Psychic [ PSYCHIC ] Power: 90 (Spec)\n  2) Zen Headbutt [ PSYCHIC ] Power: 80 (Phys)\n  3) Psybeam [ PSYCHIC ] Power: 65 (Spec)\n  4) Thunder Punch [ FIRE ] Power: 110 (Phys)\n  5) Switch Pokemon\n  6) Run Away\n```\n\nSelect option (1-6):\n\nPlease select an action from 1 to 6.\n\n────────────────────────────────────────────────────────────\n\n3\n\n● ManageTask(Input sent to task \"42560c5f-0aec-4abf-b329-894a07ec5075/task-56\".)\n\n● ManageTask(Task: 42560c5f-0aec-4abf-b329-894a07ec5075/task-56) (ctrl+o to expand)\n\nMewtwo is incredibly powerful and fast!\n\n• Mewtwo went first and used Thunder Punch! Dealt 195 damage.\n\n• Mew fainted!\n\nYou only have Lucario left:\n\nChoose a Pokemon:\n\n1) Squirtle [Lv. 50] - FAINTED\n\n2) Mew [Lv. 50] - FAINTED (Active)\n\n3) Lucario [Lv. 50] - HP: 137/137\n\nPlease select 3 (Lucario) to send it out:\n\nPlease select 3 to send out Lucario.\n\n────────────────────────────────────────────────────────────\n\n3\n\n● ManageTask(Input sent to task \"42560c5f-0aec-4abf-b329-894a07ec5075/task-56\".)\n\n● ManageTask(Task: 42560c5f-0aec-4abf-b329-894a07ec5075/task-56)\n\n● ManageTask(Input sent to task \"42560c5f-0aec-4abf-b329-894a07ec5075/task-56\".)\n\n● ManageTask(Task: 42560c5f-0aec-4abf-b329-894a07ec5075/task-56) (ctrl+o to expand)\n\nLucario is now on the field!\n\n```\n════════════════════════════════════════════════════════════\n⚡ BOSS MEWTWO [Lv. 100]\nType:  PSYCHIC\nHP:   [█████████████████████████] 1011/1011\n────────────────────────────────────────────────────────────\n🟢 YOUR LUCARIO [Lv. 50]\nType:  FIGHT   STEEL\nHP:   [█████████████████████████]   137/137\n════════════════════════════════════════════════════════════\n\nWhat will Lucario do?\n  1) Close Combat [ FIGHT ] Power: 120 (Phys)\n  2) Aura Sphere [ FIGHT ] Power: 80 (Spec)\n  3) Flash Cannon [ STEEL ] Power: 80 (Spec)\n  4) Thunder Punch [ FIRE ] Power: 110 (Phys)\n  5) Switch Pokemon\n  6) Run Away\n```\n\nSelect option (1-6):\n\nPlease select an option from 1 to 6.\n\n────────────────────────────────────────────────────────────\n\n4\n\n● ManageTask(Input sent to task \"42560c5f-0aec-4abf-b329-894a07ec5075/task-56\".)\n\n● ManageTask(Task: 42560c5f-0aec-4abf-b329-894a07ec5075/task-56)\n\n● ManageTask(Input sent to task \"42560c5f-0aec-4abf-b329-894a07ec5075/task-56\".)\n\n● ManageTask(Task: 42560c5f-0aec-4abf-b329-894a07ec5075/task-56)\n\n● ManageTask(Input sent to task \"42560c5f-0aec-4abf-b329-894a07ec5075/task-56\".)\n\n● ManageTask(Task: 42560c5f-0aec-4abf-b329-894a07ec5075/task-56) (ctrl+o to expand)\n\nMewtwo was a bit too powerful for our team!\n\n• Mewtwo went first and used Thunder Punch (Fire-type move)! Dealt 520 damage.\n\n• Lucario fainted!\n\nSince all your Pokemon fainted, you were defeated:\n\n```\n╔══════════╗\n║  DEFEAT  ║\n╚══════════╝\n\n💀 All your Pokemon fainted. Boss Mewtwo wins.\n```\n\nThe game has successfully returned to the main lobby shell:\n\n```\npoke-sim>\n```\n\nYou can now:\n\nWhat would you like to do next? You can try modifying your team, fighting another boss, or typing /exit to close\n\nthe simulator.", "url": "https://wpnews.pro/news/pokemon-battle-simulator-napkin-challenge", "canonical_source": "https://dev.to/gde/pokemon-battle-simulator-napkin-challenge-38db", "published_at": "2026-05-26 23:07:48+00:00", "updated_at": "2026-05-26 23:33:18.290070+00:00", "lang": "en", "topics": ["ai-tools", "generative-ai", "large-language-models", "artificial-intelligence"], "entities": ["Google AI", "Gemini", "Antigravity CLI", "xbill9@gmail.com"], "alternates": {"html": "https://wpnews.pro/news/pokemon-battle-simulator-napkin-challenge", "markdown": "https://wpnews.pro/news/pokemon-battle-simulator-napkin-challenge.md", "text": "https://wpnews.pro/news/pokemon-battle-simulator-napkin-challenge.txt", "jsonld": "https://wpnews.pro/news/pokemon-battle-simulator-napkin-challenge.jsonld"}}