diff --git a/include/constants/pokemon.h b/include/constants/pokemon.h
index 342f995425..963a5d8d31 100644
--- a/include/constants/pokemon.h
+++ b/include/constants/pokemon.h
@@ -375,6 +375,8 @@
 #define EVO_LEVEL_DARK_TYPE_MON_IN_PARTY  30     // Pokémon reaches the specified level with a Dark Type Pokémon in party
 #define EVO_TRADE_SPECIFIC_MON            31     // Pokémon is traded for a specified Pokémon
 #define EVO_SPECIFIC_MAP                  32     // Pokémon levels up on specified map
+#define EVO_LEVEL_NATURE_AMPED            33     // Pokémon reaches the specified level, it has a Hardy, Brave, Adamant, Naughty, Docile, Impish, Lax, Hasty, Jolly, Naive, Rash, Sassy, or Quirky nature.
+#define EVO_LEVEL_NATURE_LOW_KEY          34     // Pokémon reaches the specified level, it has a Lonely, Bold, Relaxed, Timid, Serious, Modest, Mild, Quiet, Bashful, Calm, Gentle, or Careful nature.
 
 #define EVOS_PER_MON 10