Loads of work on getting data ready.

Scripts/Items/heal_item.as

@@ -0,0 +1,26 @@
+namespace Pokemon{
+    [ItemUse effect=heal]
+    class HealItem : ItemUseScript {
+        uint _amount;
+
+        void OnInitialize(const array<EffectParameter@> &in parameters) override {
+            _amount = uint(parameters[0].AsInt());
+        }
+
+        bool IsItemUsable() override {
+            return true;
+        }
+
+        bool IsPokemonUseItem() override {
+            return true;
+        }
+
+        bool IsUseValidForPokemon(Pokemon@ pokemon) override {
+            return pokemon.CurrentHealth < pokemon.MaxHealth;
+        }
+
+        void OnPokemonUse(Pokemon@ pkmn) override {
+            pkmn.Heal(_amount);
+        }
+    }
+}