Implements switching Pokemon and fleeing from battle

PkmnLib.Dynamic/Models/BattleSide.cs

@@ -110,6 +110,16 @@ public interface IBattleSide : IScriptSource, IDeepCloneable
     /// Checks whether the side has been defeated.
     /// </summary>
     bool IsDefeated();
+    
+    /// <summary>
+    /// The number of times this side has attempted to flee.
+    /// </summary>
+    uint FleeAttempts { get; }
+    
+    /// <summary>
+    /// Registers a flee attempt for this side.
+    /// </summary>
+    void RegisterFleeAttempt();
 
     /// <summary>
     /// Mark the side as fled.
@@ -267,6 +277,15 @@ public class BattleSideImpl : ScriptSource, IBattleSide
         return _fillablePositions.All(fillable => !fillable);
     }
 
+    /// <inheritdoc />
+    public uint FleeAttempts { get; private set; }
+
+    /// <inheritdoc />
+    public void RegisterFleeAttempt()
+    {
+        FleeAttempts++;
+    }
+
     /// <inheritdoc />
     public void MarkAsFled() => HasFledBattle = true;