diff --git a/include/constants/pokemon.h b/include/constants/pokemon.h
index 0e2113abe..d0e609448 100644
--- a/include/constants/pokemon.h
+++ b/include/constants/pokemon.h
@@ -266,8 +266,4 @@
 
 #define SKIP_FRONT_ANIM (1 << 7)
 
-#define NUM_TYPE_SLOTS      2
-#define NUM_EGG_GROUP_SLOTS 2
-#define NUM_ABILITY_SLOTS   2
-
 #endif // GUARD_CONSTANTS_POKEMON_H
diff --git a/include/pokemon.h b/include/pokemon.h
index 5ee8b8ade..ab102000a 100644
--- a/include/pokemon.h
+++ b/include/pokemon.h
@@ -295,7 +295,7 @@ struct SpeciesInfo
  /* 0x03 */ u8 baseSpeed;
  /* 0x04 */ u8 baseSpAttack;
  /* 0x05 */ u8 baseSpDefense;
- /* 0x06 */ u8 types[NUM_TYPE_SLOTS];
+ /* 0x06 */ u8 types[2];
  /* 0x08 */ u8 catchRate;
  /* 0x09 */ u8 expYield;
  /* 0x0A */ u16 evYield_HP:2;
@@ -310,8 +310,8 @@ struct SpeciesInfo
  /* 0x11 */ u8 eggCycles;
  /* 0x12 */ u8 friendship;
  /* 0x13 */ u8 growthRate;
- /* 0x14 */ u8 eggGroups[NUM_EGG_GROUP_SLOTS];
- /* 0x16 */ u8 abilities[NUM_ABILITY_SLOTS];
+ /* 0x14 */ u8 eggGroups[2];
+ /* 0x16 */ u8 abilities[2];
  /* 0x18 */ u8 safariZoneFleeRate;
  /* 0x19 */ u8 bodyColor : 7;
             u8 noFlip : 1;