GO: Handle Road to Unova Timed Research encounters

First time Level 20 Mythicals have been encounterable in Research, need to account for the minimum IV difference should any more occur in the future.

PKHeX.Core/Legality/Encounters/Templates/GO/PogoType.cs

@@ -56,6 +56,10 @@ public enum PogoType : byte
     /// <remarks> Unlike standard Field Research encounters, these are boosted to Level 20. </remarks>
     Research20,
 
+    /// <summary> Mythical Pokémon captured after completing Field Research. </summary>
+    /// <remarks> Unlike standard Field Research encounters, these are boosted to Level 20. </remarks>
+    ResearchM20,
+
     /// <summary> Pokémon captured after completing Field Research. Only Beast Balls can be used. </summary>
     /// <remarks> Unlike standard Field Research encounters, these are boosted to Level 20. </remarks>
     ResearchUB20,
@@ -112,6 +116,7 @@ public static class PogoTypeExtensions
         PogoType.ResearchNH => 15,
         PogoType.Research10 => 10,
         PogoType.Research20 => 20,
+        PogoType.ResearchM20 => 20,
         PogoType.ResearchUB20 => 20,
         PogoType.GBL => 20,
         PogoType.GBLM => 20,
@@ -136,6 +141,7 @@ public static class PogoTypeExtensions
         PogoType.ResearchM => 10,
         PogoType.ResearchMP => 10,
         PogoType.ResearchMH => 10,
+        PogoType.ResearchM20 => 10,
         PogoType.GBLM => 10,
         PogoType.GBLD => 0,
         PogoType.MaxBattleM => 10,