Fix

structures/pokemon/Ability.js

@@ -14,4 +14,8 @@ module.exports = class Ability {
 				? data.flavor_text_entries.find(entry => entry.language.name === 'en').flavor_text
 				: null;
 	}
+
+	get slug() {
+		return this.store.makeSlug(this.name);
+	}
 };

structures/pokemon/Item.js

@@ -16,4 +16,8 @@ module.exports = class Item {
 		this.spriteURL = data.sprites.default || null;
 		this.cost = data.cost || 0;
 	}
+
+	get slug() {
+		return this.store.makeSlug(this.name);
+	}
 };

structures/pokemon/Move.js

@@ -26,4 +26,8 @@ module.exports = class Move {
 		return this.description
 			.replace(/\$effect_chance/gi, this.effectChance);
 	}
+
+	get slug() {
+		return this.store.makeSlug(this.name);
+	}
 };