import PokemonItemSheet from "./modules/sheets/PokemonItemSheet.js"; Hooks.once("init", function() { console.log("pokemon | Initializing the Pokémon system"); foundry.documents.collections.Items.unregisterSheet("core", foundry.appv1.sheets.ItemSheet); foundry.documents.collections.Items.registerSheet("pokemon", PokemonItemSheet, { makeDefault: true }); });