Cobblemon:Crzbrain

Built in Kotlin, CRZbrain runs on the server and adds an AI personality layer to Cobblemon. Its main purpose is to give Pokémon responses that depend on context. Pokémon answer through an embedded response engine, which reacts to battles and other interactions with the player. Sentiment analysis reads player messages written in Italian or English and scores their emotional valence, arousal and dominance on a three-dimensional model.

Behavior is shaped by reinforcement learning with a policy gradient: interactions that work well are reinforced, and failed ones are penalized. The adaptive learning component tracks which responses succeed and balances trying new behaviors against repeating proven ones. Knowledge is also shared between trainers through a consensus-based network, so a lesson taught by one trainer can benefit other Pokémon. Topic modeling and pattern mining estimate player behavior and the subjects of conversations.

Optionally, the mod can call external AI providers such as Claude, OpenAI or Gemini to enrich response quality. The mod is published for 1.21.1 only, and its latest Fabric file is 2.1.0, released on 2026-03-01. The code is under the MIT License, and the project is not open source.