Config for Sheer Cold being less accurate when not used by Ice type Pokémon

include/constants/battle_config.h

@@ -159,6 +159,7 @@
 #define B_TOXIC_NEVER_MISS          GEN_7 // In Gen6+, if Toxic is used by a Poison-type Pokémon, it will never miss.
 #define B_MINIMIZE_DMG_ACC          GEN_7 // In Gen6+, moves that causes double damage to minimized Pokémon will also skip accuracy checks.
 #define B_BLIZZARD_HAIL             GEN_7 // In Gen4+, Blizzard bypasses accuracy checks if it's hailing.
+#define B_SHEER_COLD_ACC            GEN_7 // In Gen7+, Sheer Cold's base chance of hitting is reduced to 20% if the user isn't Ice-typed.
 
 // Other move settings
 #define B_SOUND_SUBSTITUTE          GEN_7 // In Gen6+, sound moves bypass Substitute.

src/battle_script_commands.c

@@ -10728,6 +10728,10 @@ static void Cmd_tryKO(void)
         else
         {
             u16 odds = gBattleMoves[gCurrentMove].accuracy + (gBattleMons[gBattlerAttacker].level - gBattleMons[gBattlerTarget].level);
+            #if B_SHEER_COLD_ACC >= GEN_7
+                if (!IS_BATTLER_OF_TYPE(gBattlerAttacker, TYPE_ICE))
+                    odds -= 10;
+            #endif
             if (Random() % 100 + 1 < odds && gBattleMons[gBattlerAttacker].level >= gBattleMons[gBattlerTarget].level)
                 lands = TRUE;
         }