diff --git a/code/websites/pokedex.online/src/utilities/gamemaster-client.js b/code/websites/pokedex.online/src/utilities/gamemaster-client.js
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+++ b/code/websites/pokedex.online/src/utilities/gamemaster-client.js
@@ -0,0 +1,189 @@
+/**
+ * Gamemaster Client Utility
+ * Use this in any app on the site to access gamemaster data
+ *
+ * Usage:
+ *   import { GamemasterClient } from './gamemaster-client.js';
+ *   const gm = new GamemasterClient('/api/gamemaster');
+ *
+ *   // Get filtered pokemon
+ *   const pokemon = await gm.getPokemon();
+ *
+ *   // Get all forms with costumes
+ *   const allForms = await gm.getAllForms();
+ *
+ *   // Get moves
+ *   const moves = await gm.getMoves();
+ *
+ *   // Get raw unmodified data
+ *   const raw = await gm.getRaw();
+ *
+ *   // Check what's available
+ *   const status = await gm.getStatus();
+ */
+
+export class GamemasterClient {
+  constructor(baseUrl = '/api/gamemaster') {
+    this.baseUrl = baseUrl;
+    this.cache = new Map();
+  }
+
+  /**
+   * Make a request to the gamemaster API
+   * @private
+   * @param {string} endpoint
+   * @param {Object} options
+   * @returns {Promise<Object|Array>}
+   */
+  async request(endpoint, options = {}) {
+    const url = `${this.baseUrl}${endpoint}`;
+    try {
+      const response = await fetch(url, {
+        method: 'GET',
+        ...options
+      });
+
+      if (!response.ok) {
+        const error = await response.json();
+        throw new Error(error.error || `HTTP ${response.status}`);
+      }
+
+      return await response.json();
+    } catch (error) {
+      console.error(`Gamemaster API Error [${endpoint}]:`, error.message);
+      throw error;
+    }
+  }
+
+  /**
+   * Get status of available files
+   * @returns {Promise<Object>}
+   */
+  async getStatus() {
+    return this.request('/status');
+  }
+
+  /**
+   * Get filtered pokemon data (base forms + regional variants)
+   * @param {Object} options
+   * @param {boolean} options.useCache - Use cached data if available
+   * @returns {Promise<Array>}
+   */
+  async getPokemon(options = {}) {
+    if (options.useCache && this.cache.has('pokemon')) {
+      return this.cache.get('pokemon');
+    }
+
+    const data = await this.request('/pokemon');
+    this.cache.set('pokemon', data);
+    return data;
+  }
+
+  /**
+   * Get all pokemon forms including costumes, shadows, events, etc.
+   * @param {Object} options
+   * @param {boolean} options.useCache - Use cached data if available
+   * @returns {Promise<Array>}
+   */
+  async getAllForms(options = {}) {
+    if (options.useCache && this.cache.has('allForms')) {
+      return this.cache.get('allForms');
+    }
+
+    const data = await this.request('/pokemon/allForms');
+    this.cache.set('allForms', data);
+    return data;
+  }
+
+  /**
+   * Get all pokemon moves
+   * @param {Object} options
+   * @param {boolean} options.useCache - Use cached data if available
+   * @returns {Promise<Array>}
+   */
+  async getMoves(options = {}) {
+    if (options.useCache && this.cache.has('moves')) {
+      return this.cache.get('moves');
+    }
+
+    const data = await this.request('/moves');
+    this.cache.set('moves', data);
+    return data;
+  }
+
+  /**
+   * Get raw unmodified gamemaster data
+   * @param {Object} options
+   * @param {boolean} options.useCache - Use cached data if available
+   * @returns {Promise<Array>}
+   */
+  async getRaw(options = {}) {
+    if (options.useCache && this.cache.has('raw')) {
+      return this.cache.get('raw');
+    }
+
+    const data = await this.request('/raw');
+    this.cache.set('raw', data);
+    return data;
+  }
+
+  /**
+   * Download a file directly
+   * @param {string} filename - One of: pokemon.json, pokemon-allFormsCostumes.json, pokemon-moves.json, latest-raw.json
+   * @returns {Promise<void>}
+   */
+  async downloadFile(filename) {
+    const url = `${this.baseUrl}/download/${filename}`;
+    const response = await fetch(url);
+
+    if (!response.ok) {
+      throw new Error(`Failed to download ${filename}`);
+    }
+
+    const blob = await response.blob();
+    const link = document.createElement('a');
+    link.href = URL.createObjectURL(blob);
+    link.download = filename;
+    document.body.appendChild(link);
+    link.click();
+    document.body.removeChild(link);
+    URL.revokeObjectURL(link.href);
+  }
+
+  /**
+   * Clear cached data
+   * @param {string} key - Optional specific key to clear, or clears all if not provided
+   */
+  clearCache(key = null) {
+    if (key) {
+      this.cache.delete(key);
+    } else {
+      this.cache.clear();
+    }
+  }
+
+  /**
+   * Get a specific pokemon from the filtered dataset
+   * @param {string} pokemonId
+   * @returns {Promise<Object|null>}
+   */
+  async getPokemonById(pokemonId) {
+    const pokemon = await this.getPokemon({ useCache: true });
+    return pokemon.find(p => p.data?.pokemonSettings?.pokemonId === pokemonId) || null;
+  }
+
+  /**
+   * Get a specific move
+   * @param {string} moveId
+   * @returns {Promise<Object|null>}
+   */
+  async getMoveById(moveId) {
+    const moves = await this.getMoves({ useCache: true });
+    return moves.find(m => m.data?.moveSettings?.movementId === moveId) || null;
+  }
+}
+
+/**
+ * Singleton instance - use this for most cases
+ */
+export const gamemasterClient = new GamemasterClient();