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modules/sheets/PokemonItemSheet.js

@@ -1,4 +1,4 @@
-export default class PokemonItemSheet extends ItemSheet {
+export default class PokemonItemSheet extends foundry.appv1.sheets.ItemSheet {
     get template() {
         return `systems/pokemon/templates/sheets/${this.item.type}-sheet.html`
     }

pokemon.js

@@ -3,6 +3,6 @@ import PokemonItemSheet from "./modules/sheets/PokemonItemSheet.js";
 Hooks.once("init", function() {
     console.log("pokemon | Initializing the Pokémon system");
 
-    Items.unregisterSheet("core", ItemSheet);
-    Items.registerSheet("pokemon", PokemonItemSheet, { makeDefault: true });
+    foundry.documents.collections.Items.unregisterSheet("core", foundry.appv1.sheets.ItemSheet);
+    foundry.documents.collections.Items.registerSheet("pokemon", PokemonItemSheet, { makeDefault: true });
 });

system.json

@@ -1,5 +1,5 @@
 {
-    "version": "0.0.6",
+    "version": "0.0.7",
     "id": "pokemon",
     "title": "Pokémon TTRPG",
     "description": "A Pokémon TTRPG",