diff --git a/include/constants/pokemon.h b/include/constants/pokemon.h
index e87f8f8220..9129f4a710 100644
--- a/include/constants/pokemon.h
+++ b/include/constants/pokemon.h
@@ -271,6 +271,7 @@
 
 // Evolution types
 #define EVO_MEGA_EVOLUTION                0xffff // Not an actual evolution, used to temporarily mega evolve in battle.
+#define EVO_MOVE_MEGA_EVOLUTION           0xfffe // Mega Evolution that checks for a move instead of held item.
 #define EVO_FRIENDSHIP                    1      // Pokémon levels up with friendship ≥ 220
 #define EVO_FRIENDSHIP_DAY                2      // Pokémon levels up during the day with friendship ≥ 220
 #define EVO_FRIENDSHIP_NIGHT              3      // Pokémon levels up at night with friendship ≥ 220
diff --git a/src/data/pokemon/evolution.h b/src/data/pokemon/evolution.h
index 540e46300a..a6b850925d 100644
--- a/src/data/pokemon/evolution.h
+++ b/src/data/pokemon/evolution.h
@@ -251,6 +251,7 @@ const struct Evolution gEvolutionTable[NUM_SPECIES][EVOS_PER_MON] =
     [SPECIES_METAGROSS]             = {{EVO_MEGA_EVOLUTION, ITEM_NONE,/*ITEM_METAGROSSITE*/ SPECIES_METAGROSS_MEGA}},
     [SPECIES_LATIAS]                = {{EVO_MEGA_EVOLUTION, ITEM_NONE,/*ITEM_LATIASITE*/ SPECIES_LATIAS_MEGA}},
     [SPECIES_LATIOS]                = {{EVO_MEGA_EVOLUTION, ITEM_NONE,/*ITEM_LATIOSITE*/ SPECIES_LATIOS_MEGA}},
+    [SPECIES_RAYQUAZA]              = {{EVO_MOVE_MEGA_EVOLUTION, MOVE_NONE,/*MOVE_DRAGON_ASCENT*/ SPECIES_RAYQUAZA_MEGA}},
                                     
     // Gens 4-7                     
     [SPECIES_TURTWIG]               = {{EVO_LEVEL, 18, SPECIES_GROTLE}},