I Built a Pokémon Trainer AI With LangChain

A developer built an AI-powered Pokémon battle opponent using LangChain and Pokémon Showdown to create a challenging sparring partner. The system uses LangGraph to structure multi-step decision-making through specialized tools (rank_attack, rank_switch, rank_setup) rather than free-form prompts, enabling the AI to reason about battle strategy and log its decision-making process. While the AI successfully replicated competitive thinking patterns, it occasionally made incorrect assumptions (like inferring a Pokémon's type from its moves) due to relying on general model knowledge rather than a dedicated Pokémon knowledge base.