Getting started with implementing an explicit AI, based on the Essentials one.

Plugins/PkmnLib.Plugin.Gen7/Scripts/Abilities/SolarPower.cs

@@ -6,7 +6,8 @@ namespace PkmnLib.Plugin.Gen7.Scripts.Abilities;
 /// <see href="https://bulbapedia.bulbagarden.net/wiki/Solar_Power_(Ability)">Bulbapedia - Solar Power</see>
 /// </summary>
 [Script(ScriptCategory.Ability, "solar_power")]
-public class SolarPower : Script, IScriptChangeOffensiveStatValue, IScriptOnEndTurn
+public class SolarPower : Script, IScriptChangeOffensiveStatValue, IScriptOnEndTurn,
+    IAIInfoScriptExpectedEndOfTurnDamage
 {
     /// <inheritdoc />
     public void ChangeOffensiveStatValue(IExecutingMove move, IPokemon target, byte hit, uint defensiveStat,
@@ -29,6 +30,26 @@ public class SolarPower : Script, IScriptChangeOffensiveStatValue, IScriptOnEndT
         if (!pokemon.IsUsable)
             return;
 
+        var weatherName = pokemon.BattleData?.Battle.WeatherName;
+        if (weatherName != ScriptUtils.ResolveName<Weather.HarshSunlight>() &&
+            weatherName != ScriptUtils.ResolveName<Weather.DesolateLands>())
+        {
+            return;
+        }
+
         pokemon.Damage(pokemon.MaxHealth / 8, DamageSource.Weather);
     }
+
+    /// <inheritdoc />
+    public void ExpectedEndOfTurnDamage(IPokemon pokemon, ref int damage)
+    {
+        var weatherName = pokemon.BattleData?.Battle.WeatherName;
+        if (weatherName != ScriptUtils.ResolveName<Weather.HarshSunlight>() &&
+            weatherName != ScriptUtils.ResolveName<Weather.DesolateLands>())
+        {
+            return;
+        }
+
+        damage += (int)(pokemon.MaxHealth / 8f);
+    }
 }