diff --git a/asm/macros/battle_script.inc b/asm/macros/battle_script.inc
index 2bcefc1c1..32658412b 100644
--- a/asm/macros/battle_script.inc
+++ b/asm/macros/battle_script.inc
@@ -1591,7 +1591,7 @@
 
 @ helpful macros
 	.macro setstatchanger stat:req, stages:req, down:req
-	setbyte sSTATCHANGER \stat | \stages << 4 | \down << 7
+	setbyte sSTATCHANGER \stat | \stages << 3 | \down << 7
 	.endm
 	
 	.macro setmoveeffect effect:req
diff --git a/include/battle.h b/include/battle.h
index 63b507354..957cc86ed 100644
--- a/include/battle.h
+++ b/include/battle.h
@@ -597,14 +597,14 @@ struct BattleStruct
     gBattleMons[battlerId].type3 = TYPE_MYSTERY;    \
 }
 
-#define GET_STAT_BUFF_ID(n)((n & 0xF))              // first four bits 0x1, 0x2, 0x4, 0x8
-#define GET_STAT_BUFF_VALUE2(n)((n & 0xF0))
-#define GET_STAT_BUFF_VALUE(n)(((n >> 4) & 7))      // 0x10, 0x20, 0x40
+#define GET_STAT_BUFF_ID(n)((n & 7))              // first three bits 0x1, 0x2, 0x4
+#define GET_STAT_BUFF_VALUE_WITH_SIGN(n)((n & 0xF8))
+#define GET_STAT_BUFF_VALUE(n)(((n >> 3) & 0xF))      // 0x8, 0x10, 0x20, 0x40
 #define STAT_BUFF_NEGATIVE 0x80                     // 0x80, the sign bit
 
-#define SET_STAT_BUFF_VALUE(n)((((n) << 4) & 0xF0))
+#define SET_STAT_BUFF_VALUE(n)((((n) << 3) & 0xF8))
 
-#define SET_STATCHANGER(statId, stage, goesDown)(gBattleScripting.statChanger = (statId) + (stage << 4) + (goesDown << 7))
+#define SET_STATCHANGER(statId, stage, goesDown)(gBattleScripting.statChanger = (statId) + (stage << 3) + (goesDown << 7))
 
 struct BattleScripting
 {
diff --git a/src/battle_script_commands.c b/src/battle_script_commands.c
index ede2bad9b..94799a6bf 100644
--- a/src/battle_script_commands.c
+++ b/src/battle_script_commands.c
@@ -4011,7 +4011,7 @@ static void atk46_playanimation2(void) // animation Id is stored in the first po
 static void atk47_setgraphicalstatchangevalues(void)
 {
     u8 value = 0;
-    switch (GET_STAT_BUFF_VALUE2(gBattleScripting.statChanger))
+    switch (GET_STAT_BUFF_VALUE_WITH_SIGN(gBattleScripting.statChanger))
     {
     case SET_STAT_BUFF_VALUE(1): // +1
         value = STAT_ANIM_PLUS1;
@@ -6379,7 +6379,7 @@ static void atk76_various(void)
             {
                 gBattleStruct->stolenStats[0] &= ~(gBitTable[i]);
                 SET_STATCHANGER(i, gBattleStruct->stolenStats[i], FALSE);
-                if (ChangeStatBuffs(gBattleScripting.statChanger & 0xF0, i, MOVE_EFFECT_CERTAIN | MOVE_EFFECT_AFFECTS_USER, NULL) == STAT_CHANGE_WORKED)
+                if (ChangeStatBuffs(GET_STAT_BUFF_VALUE_WITH_SIGN(gBattleScripting.statChanger), i, MOVE_EFFECT_CERTAIN | MOVE_EFFECT_AFFECTS_USER, NULL) == STAT_CHANGE_WORKED)
                 {
                     BattleScriptPushCursor();
                     gBattlescriptCurrInstr = BattleScript_StatUpMsg;
@@ -7772,6 +7772,10 @@ static u32 ChangeStatBuffs(s8 statValue, u32 statId, u32 flags, const u8 *BS_ptr
         statValue ^= STAT_BUFF_NEGATIVE;
         gBattleScripting.statChanger ^= STAT_BUFF_NEGATIVE;
     }
+    else if (GetBattlerAbility(gActiveBattler) == ABILITY_SIMPLE)
+    {
+        statValue = (SET_STAT_BUFF_VALUE(GET_STAT_BUFF_VALUE(statValue) * 2)) | ((statValue <= -1) ? STAT_BUFF_NEGATIVE : 0);
+    }
 
     PREPARE_STAT_BUFFER(gBattleTextBuff1, statId);
 
@@ -7939,7 +7943,7 @@ static u32 ChangeStatBuffs(s8 statValue, u32 statId, u32 flags, const u8 *BS_ptr
 static void atk89_statbuffchange(void)
 {
     const u8 *jumpPtr = T1_READ_PTR(gBattlescriptCurrInstr + 3);
-    if (ChangeStatBuffs(gBattleScripting.statChanger & 0xF0, GET_STAT_BUFF_ID(gBattleScripting.statChanger), T1_READ_16(gBattlescriptCurrInstr + 1), jumpPtr) == STAT_CHANGE_WORKED)
+    if (ChangeStatBuffs(GET_STAT_BUFF_VALUE_WITH_SIGN(gBattleScripting.statChanger), GET_STAT_BUFF_ID(gBattleScripting.statChanger), T1_READ_16(gBattlescriptCurrInstr + 1), jumpPtr) == STAT_CHANGE_WORKED)
         gBattlescriptCurrInstr += 7;
 }