diff --git a/include/constants/battle_move_effects.h b/include/constants/battle_move_effects.h
index b01685fbb72e..abb1a9ab0f62 100644
--- a/include/constants/battle_move_effects.h
+++ b/include/constants/battle_move_effects.h
@@ -351,6 +351,7 @@ enum {
     EFFECT_LAST_RESPECTS,
     EFFECT_TIDY_UP,
     EFFECT_TERA_BLAST,
+    EFFECT_TERA_STARSTORM,
     NUM_BATTLE_MOVE_EFFECTS,
 };
 
diff --git a/src/battle_controller_player.c b/src/battle_controller_player.c
index b86da34d2421..be6a63e00bd9 100644
--- a/src/battle_controller_player.c
+++ b/src/battle_controller_player.c
@@ -693,17 +693,8 @@ static void HandleInputChooseMove(u32 battler)
     if (JOY_NEW(A_BUTTON))
     {
         PlaySE(SE_SELECT);
-        if (moveInfo->moves[gMoveSelectionCursor[battler]] == MOVE_CURSE)
-        {
-            if (moveInfo->monType1 != TYPE_GHOST && moveInfo->monType2 != TYPE_GHOST && moveInfo->monType3 != TYPE_GHOST)
-                moveTarget = MOVE_TARGET_USER;
-            else
-                moveTarget = MOVE_TARGET_SELECTED;
-        }
-        else
-        {
-            moveTarget = GetBattlerMoveTargetType(battler, moveInfo->moves[gMoveSelectionCursor[battler]]);
-        }
+
+        moveTarget = GetBattlerMoveTargetType(battler, moveInfo->moves[gMoveSelectionCursor[battler]]);
 
         if (gBattleStruct->zmove.viewing)
         {
@@ -931,6 +922,7 @@ static void HandleInputChooseMove(u32 battler)
         {
             gBattleStruct->tera.playerSelect ^= 1;
             ChangeTeraTriggerSprite(gBattleStruct->tera.triggerSpriteId, gBattleStruct->tera.playerSelect);
+            MoveSelectionDisplayMoveType(battler); // For Tera Blast / Tera Starstorm
             PlaySE(SE_SELECT);
         }
     }
@@ -1748,25 +1740,32 @@ static void MoveSelectionDisplayMoveType(u32 battler)
     u8 *txtPtr, *end;
     u8 type;
     u32 speciesId;
-    struct Pokemon *mon;
     struct ChooseMoveStruct *moveInfo = (struct ChooseMoveStruct *)(&gBattleResources->bufferA[battler][4]);
 
     txtPtr = StringCopy(gDisplayedStringBattle, gText_MoveInterfaceType);
 
-    if (moveInfo->moves[gMoveSelectionCursor[battler]] == MOVE_IVY_CUDGEL)
+    type = gMovesInfo[moveInfo->moves[gMoveSelectionCursor[battler]]].type;
+
+    if (moveInfo->moves[gMoveSelectionCursor[battler]] == MOVE_TERA_BLAST)
+    {
+        if (gBattleStruct->tera.playerSelect || IsTerastallized(battler))
+            type = GetBattlerTeraType(battler);
+    }
+    else if (moveInfo->moves[gMoveSelectionCursor[battler]] == MOVE_IVY_CUDGEL)
     {
-        mon = &GetSideParty(GetBattlerSide(battler))[gBattlerPartyIndexes[battler]];
-        speciesId = GetMonData(mon, MON_DATA_SPECIES);
+        speciesId = gBattleMons[battler].species;
 
         if (speciesId == SPECIES_OGERPON_WELLSPRING_MASK || speciesId == SPECIES_OGERPON_WELLSPRING_MASK_TERA
             || speciesId == SPECIES_OGERPON_HEARTHFLAME_MASK || speciesId == SPECIES_OGERPON_HEARTHFLAME_MASK_TERA
             || speciesId == SPECIES_OGERPON_CORNERSTONE_MASK || speciesId == SPECIES_OGERPON_CORNERSTONE_MASK_TERA)
             type = gBattleMons[battler].type2;
-        else
-            type = gMovesInfo[MOVE_IVY_CUDGEL].type;
     }
-    else
-        type = gMovesInfo[moveInfo->moves[gMoveSelectionCursor[battler]]].type;
+    else if (moveInfo->moves[gMoveSelectionCursor[battler]] == MOVE_TERA_STARSTORM)
+    {
+        if (gBattleMons[battler].species == SPECIES_TERAPAGOS_STELLAR
+        || (gBattleStruct->tera.playerSelect && gBattleMons[battler].species == SPECIES_TERAPAGOS_TERASTAL))
+            type = TYPE_STELLAR;
+    }
 
     end = StringCopy(txtPtr, gTypesInfo[type].name);
     PrependFontIdToFit(txtPtr, end, FONT_NORMAL, WindowWidthPx(B_WIN_MOVE_TYPE) - 25);
diff --git a/src/battle_gfx_sfx_util.c b/src/battle_gfx_sfx_util.c
index 91861b3b4aaa..8cc5afb424c0 100644
--- a/src/battle_gfx_sfx_util.c
+++ b/src/battle_gfx_sfx_util.c
@@ -263,17 +263,7 @@ u16 ChooseMoveAndTargetInBattlePalace(u32 battler)
         }
     }
 
-    if (moveInfo->moves[chosenMoveId] == MOVE_CURSE)
-    {
-        if (moveInfo->monType1 != TYPE_GHOST && moveInfo->monType2 != TYPE_GHOST && moveInfo->monType3 != TYPE_GHOST)
-            moveTarget = MOVE_TARGET_USER;
-        else
-            moveTarget = MOVE_TARGET_SELECTED;
-    }
-    else
-    {
-        moveTarget = GetBattlerMoveTargetType(battler, moveInfo->moves[chosenMoveId]);
-    }
+    moveTarget = GetBattlerMoveTargetType(battler, moveInfo->moves[chosenMoveId]);
 
     if (moveTarget & MOVE_TARGET_USER)
         chosenMoveId |= (battler << 8);
diff --git a/src/battle_main.c b/src/battle_main.c
index 30154ef17268..d7bbb764bf83 100644
--- a/src/battle_main.c
+++ b/src/battle_main.c
@@ -5341,7 +5341,7 @@ static void PopulateArrayWithBattlers(u8 *battlers)
 static bool32 TryDoGimmicksBeforeMoves(void)
 {
     if (!(gHitMarker & HITMARKER_RUN)
-        && (gBattleStruct->mega.toEvolve || gBattleStruct->burst.toBurst 
+        && (gBattleStruct->mega.toEvolve || gBattleStruct->burst.toBurst
             || gBattleStruct->dynamax.toDynamax || gBattleStruct->tera.toTera))
     {
         u32 i, battler;
@@ -6072,6 +6072,10 @@ void SetTypeBeforeUsingMove(u32 move, u32 battlerAtk)
     {
         gBattleStruct->dynamicMoveType = GetBattlerTeraType(battlerAtk) | F_DYNAMIC_TYPE_SET;
     }
+    else if (gMovesInfo[move].effect == EFFECT_TERA_STARSTORM && gBattleMons[battlerAtk].species == SPECIES_TERAPAGOS_STELLAR)
+    {
+        gBattleStruct->dynamicMoveType = TYPE_STELLAR | F_DYNAMIC_TYPE_SET;
+    }
 
     attackerAbility = GetBattlerAbility(battlerAtk);
 
@@ -6081,6 +6085,7 @@ void SetTypeBeforeUsingMove(u32 move, u32 battlerAtk)
              && gMovesInfo[move].effect != EFFECT_CHANGE_TYPE_ON_ITEM
              && gMovesInfo[move].effect != EFFECT_NATURAL_GIFT
              && !(gMovesInfo[move].effect == EFFECT_TERA_BLAST && IsTerastallized(battlerAtk))
+             && !(gMovesInfo[move].effect == EFFECT_TERA_STARSTORM && gBattleMons[battlerAtk].species == SPECIES_TERAPAGOS_STELLAR)
              && ((attackerAbility == ABILITY_PIXILATE && (ateType = TYPE_FAIRY))
                  || (attackerAbility == ABILITY_REFRIGERATE && (ateType = TYPE_ICE))
                  || (attackerAbility == ABILITY_AERILATE && (ateType = TYPE_FLYING))
diff --git a/src/battle_script_commands.c b/src/battle_script_commands.c
index ce8a1635050e..bfbb2b3ca09c 100644
--- a/src/battle_script_commands.c
+++ b/src/battle_script_commands.c
@@ -16735,7 +16735,8 @@ void BS_AllySwitchFailChance(void)
 void BS_SetPhotonGeyserCategory(void)
 {
     NATIVE_ARGS();
-    if (!(gMovesInfo[gCurrentMove].effect == EFFECT_TERA_BLAST && !IsTerastallized(gBattlerAttacker)))
+    if (!(gMovesInfo[gCurrentMove].effect == EFFECT_TERA_BLAST && !IsTerastallized(gBattlerAttacker))
+     && !(gMovesInfo[gCurrentMove].effect == EFFECT_TERA_STARSTORM && gBattleMons[gBattlerAttacker].species != SPECIES_TERAPAGOS_STELLAR))
         gBattleStruct->swapDamageCategory = (GetCategoryBasedOnStats(gBattlerAttacker) == DAMAGE_CATEGORY_PHYSICAL);
     gBattlescriptCurrInstr = cmd->nextInstr;
 }
diff --git a/src/battle_util.c b/src/battle_util.c
index 6e82195b3472..6d6ce38a7cf8 100644
--- a/src/battle_util.c
+++ b/src/battle_util.c
@@ -8043,10 +8043,6 @@ u32 GetMoveTarget(u16 move, u8 setTarget)
     else
         moveTarget = GetBattlerMoveTargetType(gBattlerAttacker, move);
 
-    // Special cases
-    if (move == MOVE_CURSE && !IS_BATTLER_OF_TYPE(gBattlerAttacker, TYPE_GHOST))
-        moveTarget = MOVE_TARGET_USER;
-
     switch (moveTarget)
     {
     case MOVE_TARGET_SELECTED:
@@ -10104,6 +10100,8 @@ static inline void MulByTypeEffectiveness(uq4_12_t *modifier, u32 move, u32 move
         mod = UQ_4_12(1.0);
     if (moveType == TYPE_FIRE && gDisableStructs[battlerDef].tarShot)
         mod = UQ_4_12(2.0);
+    if (moveType == TYPE_STELLAR && IsTerastallized(battlerDef))
+        mod = UQ_4_12(2.0);
 
     // B_WEATHER_STRONG_WINDS weakens Super Effective moves against Flying-type Pokémon
     if (gBattleWeather & B_WEATHER_STRONG_WINDS && WEATHER_HAS_EFFECT)
@@ -10220,16 +10218,12 @@ uq4_12_t CalcTypeEffectivenessMultiplier(u32 move, u32 moveType, u32 battlerAtk,
 {
     uq4_12_t modifier = UQ_4_12(1.0);
 
-    if (move != MOVE_STRUGGLE && moveType != TYPE_MYSTERY && moveType != TYPE_STELLAR)
+    if (move != MOVE_STRUGGLE && moveType != TYPE_MYSTERY)
     {
         modifier = CalcTypeEffectivenessMultiplierInternal(move, moveType, battlerAtk, battlerDef, recordAbilities, modifier, defAbility);
         if (gMovesInfo[move].effect == EFFECT_TWO_TYPED_MOVE)
             modifier = CalcTypeEffectivenessMultiplierInternal(move, gMovesInfo[move].argument, battlerAtk, battlerDef, recordAbilities, modifier, defAbility);
     }
-    else if (moveType == TYPE_STELLAR)
-    {
-        modifier = IsTerastallized(battlerDef) ? UQ_4_12(2.0) : UQ_4_12(1.0);
-    }
 
     if (recordAbilities)
         UpdateMoveResultFlags(modifier);
@@ -11173,11 +11167,17 @@ bool32 IsBattlerWeatherAffected(u32 battler, u32 weatherFlags)
 // Possible return values are defined in battle.h following MOVE_TARGET_SELECTED
 u32 GetBattlerMoveTargetType(u32 battler, u32 move)
 {
-    if (gMovesInfo[move].effect == EFFECT_EXPANDING_FORCE
+    if (move == MOVE_CURSE
+        && !IS_BATTLER_OF_TYPE(battler, TYPE_GHOST))
+        return MOVE_TARGET_USER;
+    else if (gMovesInfo[move].effect == EFFECT_EXPANDING_FORCE
         && IsBattlerTerrainAffected(battler, STATUS_FIELD_PSYCHIC_TERRAIN))
         return MOVE_TARGET_BOTH;
-    else
-        return gMovesInfo[move].target;
+    else if (gMovesInfo[move].effect == EFFECT_TERA_STARSTORM
+        && gBattleMons[battler].species == SPECIES_TERAPAGOS_STELLAR)
+        return MOVE_TARGET_BOTH;
+
+    return gMovesInfo[move].target;
 }
 
 bool32 CanTargetBattler(u32 battlerAtk, u32 battlerDef, u16 move)
diff --git a/src/data/battle_move_effects.h b/src/data/battle_move_effects.h
index de8d3f9ec8a0..29acfc4630cf 100644
--- a/src/data/battle_move_effects.h
+++ b/src/data/battle_move_effects.h
@@ -2236,4 +2236,10 @@ const struct BattleMoveEffect gBattleMoveEffects[NUM_BATTLE_MOVE_EFFECTS] =
         .battleScript = BattleScript_EffectPhotonGeyser,
         .battleTvScore = 0, // TODO: Assign points
     },
+
+    [EFFECT_TERA_STARSTORM] =
+    {
+        .battleScript = BattleScript_EffectPhotonGeyser,
+        .battleTvScore = 0, // TODO: Assign points
+    },
 };
diff --git a/src/data/moves_info.h b/src/data/moves_info.h
index ed7b80ce95ca..0899e55a869f 100644
--- a/src/data/moves_info.h
+++ b/src/data/moves_info.h
@@ -19563,12 +19563,12 @@ const struct MoveInfo gMovesInfo[MOVES_COUNT_DYNAMAX] =
         .description = COMPOUND_STRING(
             "Damages all opponents if user is\n"
             "Stellar form Terapagos."),
-        .effect = EFFECT_PLACEHOLDER, //EFFECT_TERA_STARSTORM
+        .effect = EFFECT_TERA_STARSTORM,
         .power = 120,
-        .type = TYPE_NORMAL, // Stellar type if used by Terapagos-Stellar
+        .type = TYPE_NORMAL,
         .accuracy = 100,
         .pp = 5,
-        .target = MOVE_TARGET_SELECTED, // MOVE_TARGET_BOTH if used by Terapagos-Stellar
+        .target = MOVE_TARGET_SELECTED,
         .priority = 0,
         .category = DAMAGE_CATEGORY_SPECIAL,
         .assistBanned = TRUE,
diff --git a/src/data/pokemon/form_species_tables.h b/src/data/pokemon/form_species_tables.h
index 9ae2c3ebdb89..af35503fe336 100644
--- a/src/data/pokemon/form_species_tables.h
+++ b/src/data/pokemon/form_species_tables.h
@@ -2169,7 +2169,7 @@ static const u16 sOgerponFormSpeciesIdTable[] = {
 static const u16 sTerapagosFormSpeciesIdTable[] = {
     SPECIES_TERAPAGOS_NORMAL,
     SPECIES_TERAPAGOS_TERASTAL,
-#if P_TERA_FORMS    
+#if P_TERA_FORMS
     SPECIES_TERAPAGOS_STELLAR,
 #endif
     FORM_SPECIES_END,
diff --git a/test/battle/move_effect/curse.c b/test/battle/move_effect/curse.c
new file mode 100644
index 000000000000..5fe17d356101
--- /dev/null
+++ b/test/battle/move_effect/curse.c
@@ -0,0 +1,36 @@
+#include "global.h"
+#include "test/battle.h"
+
+ASSUMPTIONS
+{
+    ASSUME(gMovesInfo[MOVE_CURSE].effect == EFFECT_CURSE);
+}
+
+SINGLE_BATTLE_TEST("Curse lowers Speed, raises Attack, and raises Defense when used by non-Ghost-types")
+{
+    GIVEN {
+        PLAYER(SPECIES_WOBBUFFET);
+        OPPONENT(SPECIES_WOBBUFFET);
+    } WHEN {
+        TURN { MOVE(player, MOVE_CURSE); }
+    } SCENE {
+        ANIMATION(ANIM_TYPE_MOVE, MOVE_CURSE, player);
+        MESSAGE("Wobbuffet's Speed fell!");
+        MESSAGE("Wobbuffet's Attack rose!");
+        MESSAGE("Wobbuffet's Defense rose!");
+    }
+}
+
+SINGLE_BATTLE_TEST("Curse cuts the user's HP in half when used by Ghost-types")
+{
+    GIVEN {
+        PLAYER(SPECIES_MISDREAVUS);
+        OPPONENT(SPECIES_WOBBUFFET);
+    } WHEN {
+        TURN { MOVE(player, MOVE_CURSE); }
+    } SCENE {
+        s32 maxHP = GetMonData(&PLAYER_PARTY[0], MON_DATA_MAX_HP);
+        ANIMATION(ANIM_TYPE_MOVE, MOVE_CURSE, player);
+        HP_BAR(player, hp: maxHP / 2);
+    }
+}