Add egg held item check

no hold pls
#1257

PKHeX.Core/Legality/Checks.cs

@@ -47,6 +47,8 @@ namespace PKHeX.Core
                 AddLine(Severity.Invalid, V204, CheckIdentifier.Form);
             if (pkm.Format == 3 && pkm.HeldItem == 175)
                 VerifyEReaderBerry();
+            if (pkm.IsEgg)
+                AddLine(Severity.Invalid, V419, CheckIdentifier.Egg);
         }
         private void VerifyEReaderBerry()
         {

PKHeX.Core/Legality/LegalityCheckStrings.cs

@@ -400,6 +400,7 @@ namespace PKHeX.Core
         public static string V416 {get; set;} = "Mystery Gift cannot be received by this version."; // Invalid
         public static string V417 {get; set;} = "Suspicious Original Trainer details.";
         public static string V418 {get; set;} = "Individual EV without changing EXP cannot be greater than {0}.";
+        public static string V419 {get; set;} = "Eggs cannot hold items.";
 
         public static string V600 { get; set; } = "Invalid Ribbons: {0}";
         public static string V601 { get; set; } = "Missing Ribbons: {0}";

PKHeX.Core/Resources/text/en/LegalityCheckStrings_en.txt

@@ -338,6 +338,7 @@ V415 = Eggs cannot have Pokéathlon stats.
 V416 = Mystery Gift cannot be received by this version.
 V417 = Suspicious Original Trainer details.
 V418 = Individual EV without changing EXP cannot be greater than {0}.
+V419 = Eggs cannot hold items.
 V602 = All ribbons accounted for.
 V600 = Missing Ribbons: {0}
 V601 = Invalid Ribbons: {0}

PKHeX.Core/Resources/text/ko/LegalityCheckStrings_ko.txt

@@ -338,6 +338,7 @@ V415 = Eggs cannot have Pokéathlon stats.
 V416 = Mystery Gift cannot be received by this version.
 V417 = Suspicious Original Trainer details.
 V418 = Individual EV without changing EXP cannot be greater than {0}.
+V419 = Eggs cannot hold items.
 V602 = 모든 리본이 채워졌습니다.
 V600 = 없는 리본: {0}
 V601 = 사용할 수 없는 리본: {0}

PKHeX.Core/Resources/text/zh/LegalityCheckStrings_zh.txt

@@ -338,6 +338,7 @@ V415 = Eggs cannot have Pokéathlon stats.
 V416 = Mystery Gift cannot be received by this version.
 V417 = Suspicious Original Trainer details.
 V418 = Individual EV without changing EXP cannot be greater than {0}.
+V419 = Eggs cannot hold items.
 V602 = 所有奖章合法。
 V600 = 缺失奖章: {0}
 V601 = 不合法奖章: {0}