Fix Meowstic edge case (#1906)

Edge cases with `-F` as forms are already handled in the code

PKHeX.Core/PKM/ShowdownSet.cs

@@ -256,7 +256,10 @@ namespace PKHeX.Core
                 Gender = last3.Substring(1, 1);
                 line = line.Substring(0, line.Length - 3);
             }
-
+            
+            // Meowstic Edge Case
+            if (line == "Meowstic") Gender = "M";
+            
             // Nickname Detection
             if (line.Contains("(") && line.Contains(")"))
                 ParseSpeciesNickname(line);