diff --git a/data/battle_scripts_1.s b/data/battle_scripts_1.s
index 844368d12d..f4870fd73d 100644
--- a/data/battle_scripts_1.s
+++ b/data/battle_scripts_1.s
@@ -32,7 +32,7 @@ gBattleScriptsForMoveEffects:: @ 82D86A8
 	.4byte BattleScript_EffectSpecialDefenseUp
 	.4byte BattleScript_EffectAccuracyUp
 	.4byte BattleScript_EffectEvasionUp
-	.4byte BattleScript_EffectUnused17
+	.4byte BattleScript_EffectSpecialAttackUp3
 	.4byte BattleScript_EffectAttackDown
 	.4byte BattleScript_EffectDefenseDown
 	.4byte BattleScript_EffectSpeedDown
@@ -111,7 +111,7 @@ gBattleScriptsForMoveEffects:: @ 82D86A8
 	.4byte BattleScript_EffectConversion2
 	.4byte BattleScript_EffectLockOn
 	.4byte BattleScript_EffectSketch
-	.4byte BattleScript_EffectUnused60
+	.4byte BattleScript_EffectHammerArm
 	.4byte BattleScript_EffectSleepTalk
 	.4byte BattleScript_EffectDestinyBond
 	.4byte BattleScript_EffectFlail
@@ -1720,10 +1720,8 @@ BattleScript_EffectPlaceholder:
 	printstring STRINGID_NOTDONEYET
 	goto BattleScript_MoveEnd
 
-BattleScript_EffectUnused17:
 BattleScript_EffectEvasionDownHit:
 BattleScript_EffectVitalThrow:
-BattleScript_EffectUnused60:
 BattleScript_EffectFalseSwipe:
 BattleScript_EffectAlwaysCrit:
 BattleScript_EffectPursuit:
@@ -1759,7 +1757,6 @@ BattleScript_EffectFoulPlay:
 BattleScript_EffectPsyshock:
 BattleScript_EffectWeatherBall:
 BattleScript_EffectHiddenPower:
-BattleScript_EffectFreezeDry:
 BattleScript_EffectTwoTypedMove:
 BattleScript_EffectTechnoBlast:
 BattleScript_EffectJudgment:
@@ -1920,6 +1917,7 @@ BattleScript_EffectScald:
 	setmoveeffect MOVE_EFFECT_BURN
 	goto BattleScript_EffectHit
 
+BattleScript_EffectFreezeDry:
 BattleScript_EffectFreezeHit::
 	setmoveeffect MOVE_EFFECT_FREEZE
 	goto BattleScript_EffectHit
@@ -2546,6 +2544,10 @@ BattleScript_EffectSpecialAttackUp2::
 	setstatchanger STAT_SPATK, 2, FALSE
 	goto BattleScript_EffectStatUp
 
+BattleScript_EffectSpecialAttackUp3::
+	setstatchanger STAT_SPATK, 3, FALSE
+	goto BattleScript_EffectStatUp
+
 BattleScript_EffectSpecialDefenseUp2::
 	setstatchanger STAT_SPDEF, 2, FALSE
 	goto BattleScript_EffectStatUp
@@ -4268,6 +4270,10 @@ BattleScript_EffectOverheat::
 	setmoveeffect MOVE_EFFECT_SP_ATK_TWO_DOWN | MOVE_EFFECT_AFFECTS_USER | MOVE_EFFECT_CERTAIN
 	goto BattleScript_EffectHit
 
+BattleScript_EffectHammerArm::
+	setmoveeffect MOVE_EFFECT_SPD_MINUS_1 | MOVE_EFFECT_AFFECTS_USER | MOVE_EFFECT_CERTAIN
+	goto BattleScript_EffectHit
+
 BattleScript_EffectTickle::
 	attackcanceler
 	attackstring
diff --git a/include/constants/battle_move_effects.h b/include/constants/battle_move_effects.h
index 588fe97739..bd52d065e6 100644
--- a/include/constants/battle_move_effects.h
+++ b/include/constants/battle_move_effects.h
@@ -18,7 +18,7 @@
 #define EFFECT_SPECIAL_DEFENSE_UP 14
 #define EFFECT_ACCURACY_UP 15
 #define EFFECT_EVASION_UP 16
-#define EFFECT_UNUSED_17 17
+#define EFFECT_SPECIAL_ATTACK_UP_3 17
 #define EFFECT_ATTACK_DOWN 18
 #define EFFECT_DEFENSE_DOWN 19
 #define EFFECT_SPEED_DOWN 20
@@ -97,7 +97,7 @@
 #define EFFECT_CONVERSION_2 93
 #define EFFECT_LOCK_ON 94
 #define EFFECT_SKETCH 95
-#define EFFECT_UNUSED_60 96  // thaw
+#define EFFECT_HAMMER_ARM 96
 #define EFFECT_SLEEP_TALK 97
 #define EFFECT_DESTINY_BOND 98
 #define EFFECT_FLAIL 99
diff --git a/src/data/battle_moves.h b/src/data/battle_moves.h
index 89f499c2b9..63fbdc2f57 100644
--- a/src/data/battle_moves.h
+++ b/src/data/battle_moves.h
@@ -285,7 +285,7 @@ const struct BattleMove gBattleMoves[MOVES_COUNT] =
         .effect = EFFECT_TRAP,
         .power = 15,
         .type = TYPE_NORMAL,
-        .accuracy = 75,
+        .accuracy = 85,
         .pp = 20,
         .secondaryEffectChance = 100,
         .target = MOVE_TARGET_SELECTED,
@@ -367,10 +367,10 @@ const struct BattleMove gBattleMoves[MOVES_COUNT] =
     [MOVE_JUMP_KICK] =
     {
         .effect = EFFECT_RECOIL_IF_MISS,
-        .power = 70,
+        .power = 100,
         .type = TYPE_FIGHTING,
         .accuracy = 95,
-        .pp = 25,
+        .pp = 10,
         .secondaryEffectChance = 0,
         .target = MOVE_TARGET_SELECTED,
         .priority = 0,
@@ -705,7 +705,7 @@ const struct BattleMove gBattleMoves[MOVES_COUNT] =
         .effect = EFFECT_DISABLE,
         .power = 0,
         .type = TYPE_NORMAL,
-        .accuracy = 55,
+        .accuracy = 100,
         .pp = 20,
         .secondaryEffectChance = 0,
         .target = MOVE_TARGET_SELECTED,
@@ -1780,12 +1780,12 @@ const struct BattleMove gBattleMoves[MOVES_COUNT] =
 
     [MOVE_WATERFALL] =
     {
-        .effect = EFFECT_HIT,
+        .effect = EFFECT_FLINCH_HIT,
         .power = 80,
         .type = TYPE_WATER,
         .accuracy = 100,
         .pp = 15,
-        .secondaryEffectChance = 0,
+        .secondaryEffectChance = 20,
         .target = MOVE_TARGET_SELECTED,
         .priority = 0,
         .flags = FLAG_MAKES_CONTACT | FLAG_PROTECT_AFFECTED | FLAG_MIRROR_MOVE_AFFECTED | FLAG_KINGSROCK_AFFECTED | FLAG_SHEER_FORCE_BOOST,
@@ -1907,10 +1907,10 @@ const struct BattleMove gBattleMoves[MOVES_COUNT] =
     [MOVE_HI_JUMP_KICK] =
     {
         .effect = EFFECT_RECOIL_IF_MISS,
-        .power = 100,
+        .power = 130,
         .type = TYPE_FIGHTING,
         .accuracy = 90,
-        .pp = 20,
+        .pp = 10,
         .secondaryEffectChance = 0,
         .target = MOVE_TARGET_SELECTED,
         .priority = 0,
@@ -4120,7 +4120,7 @@ const struct BattleMove gBattleMoves[MOVES_COUNT] =
 
     [MOVE_TAIL_GLOW] =
     {
-        .effect = EFFECT_SPECIAL_ATTACK_UP_2,
+        .effect = EFFECT_SPECIAL_ATTACK_UP_3,
         .power = 0,
         .type = TYPE_BUG,
         .accuracy = 100,
@@ -5033,12 +5033,12 @@ const struct BattleMove gBattleMoves[MOVES_COUNT] =
 
     [MOVE_HAMMER_ARM] =
     {
-        .effect = EFFECT_SPEED_DOWN,
+        .effect = EFFECT_HAMMER_ARM,
         .power = 100,
         .type = TYPE_FIGHTING,
         .accuracy = 90,
         .pp = 10,
-        .secondaryEffectChance = 100,
+        .secondaryEffectChance = 0,
         .target = MOVE_TARGET_SELECTED,
         .priority = 0,
         .flags = FLAG_MAKES_CONTACT | FLAG_PROTECT_AFFECTED | FLAG_MIRROR_MOVE_AFFECTED | FLAG_KINGSROCK_AFFECTED | FLAG_IRON_FIST_BOOST,
@@ -8815,7 +8815,7 @@ const struct BattleMove gBattleMoves[MOVES_COUNT] =
 
     [MOVE_ICE_HAMMER] =
     {
-        .effect = EFFECT_SPEED_DOWN_HIT,
+        .effect = EFFECT_HAMMER_ARM,
         .power = 100,
         .type = TYPE_ICE,
         .accuracy = 90,