diff --git a/public/audio/cry/718-10-complete.m4a b/public/audio/cry/718-10-complete.m4a
new file mode 100644
index 00000000000..94d95360553
Binary files /dev/null and b/public/audio/cry/718-10-complete.m4a differ
diff --git a/src/battle-scene.ts b/src/battle-scene.ts
index 850d0baab5d..a84baa55266 100644
--- a/src/battle-scene.ts
+++ b/src/battle-scene.ts
@@ -1389,7 +1389,7 @@ export default class BattleScene extends SceneBase {
     case Species.GRENINJA:
       return Utils.randSeedInt(2);
     case Species.ZYGARDE:
-      return Utils.randSeedInt(3);
+      return Utils.randSeedInt(4);
     case Species.MINIOR:
       return Utils.randSeedInt(6);
     case Species.ALCREMIE:
diff --git a/src/data/ability.ts b/src/data/ability.ts
index 07fd48e2f91..6c4dededa04 100644
--- a/src/data/ability.ts
+++ b/src/data/ability.ts
@@ -5535,16 +5535,18 @@ export function initAbilities() {
       .attr(UnsuppressableAbilityAbAttr)
       .attr(NoFusionAbilityAbAttr)
       .bypassFaint(),
-    new Ability(Abilities.POWER_CONSTRUCT, 7) // TODO: 10% Power Construct Zygarde isn't accounted for yet. If changed, update Zygarde's getSpeciesFormIndex entry accordingly
-      .attr(PostBattleInitFormChangeAbAttr, () => 2)
-      .attr(PostSummonFormChangeAbAttr, p => p.getHpRatio() <= 0.5 || p.getFormKey() === "complete" ? 4 : 2)
-      .attr(PostTurnFormChangeAbAttr, p => p.getHpRatio() <= 0.5 || p.getFormKey() === "complete" ? 4 : 2)
+    new Ability(Abilities.POWER_CONSTRUCT, 7)
+      .conditionalAttr(pokemon => pokemon.formIndex === 2 || pokemon.formIndex === 4, PostBattleInitFormChangeAbAttr, () => 2)
+      .conditionalAttr(pokemon => pokemon.formIndex === 3 || pokemon.formIndex === 5, PostBattleInitFormChangeAbAttr, () => 3)
+      .conditionalAttr(pokemon => pokemon.formIndex === 2 || pokemon.formIndex === 4, PostSummonFormChangeAbAttr, p => p.getHpRatio() <= 0.5 || p.getFormKey() === "complete" ? 4 : 2)
+      .conditionalAttr(pokemon => pokemon.formIndex === 2 || pokemon.formIndex === 4, PostTurnFormChangeAbAttr, p => p.getHpRatio() <= 0.5 || p.getFormKey() === "complete" ? 4 : 2)
+      .conditionalAttr(pokemon => pokemon.formIndex === 3 || pokemon.formIndex === 5, PostSummonFormChangeAbAttr, p => p.getHpRatio() <= 0.5 || p.getFormKey() === "10-complete" ? 5 : 3)
+      .conditionalAttr(pokemon => pokemon.formIndex === 3 || pokemon.formIndex === 5, PostTurnFormChangeAbAttr, p => p.getHpRatio() <= 0.5 || p.getFormKey() === "10-complete" ? 5 : 3)
       .attr(UncopiableAbilityAbAttr)
       .attr(UnswappableAbilityAbAttr)
       .attr(UnsuppressableAbilityAbAttr)
       .attr(NoFusionAbilityAbAttr)
-      .bypassFaint()
-      .partial(),
+      .bypassFaint(),
     new Ability(Abilities.CORROSION, 7)
       .attr(IgnoreTypeStatusEffectImmunityAbAttr, [ StatusEffect.POISON, StatusEffect.TOXIC ], [ Type.STEEL, Type.POISON ])
       .edgeCase(), // Should interact correctly with magic coat/bounce (not yet implemented), fling with toxic orb (not implemented yet), and synchronize (not fully implemented yet)
diff --git a/src/data/pokemon-forms.ts b/src/data/pokemon-forms.ts
index 03b6b89e5b1..7cc20d50fb9 100644
--- a/src/data/pokemon-forms.ts
+++ b/src/data/pokemon-forms.ts
@@ -799,8 +799,8 @@ export const pokemonFormChanges: PokemonFormChanges = {
   [Species.ZYGARDE]: [
     new SpeciesFormChange(Species.ZYGARDE, "50-pc", "complete", new SpeciesFormChangeManualTrigger(), true),
     new SpeciesFormChange(Species.ZYGARDE, "complete", "50-pc", new SpeciesFormChangeManualTrigger(), true),
-    new SpeciesFormChange(Species.ZYGARDE, "10-pc", "complete", new SpeciesFormChangeManualTrigger(), true),
-    new SpeciesFormChange(Species.ZYGARDE, "complete", "10-pc", new SpeciesFormChangeManualTrigger(), true)
+    new SpeciesFormChange(Species.ZYGARDE, "10-pc", "10-complete", new SpeciesFormChangeManualTrigger(), true),
+    new SpeciesFormChange(Species.ZYGARDE, "10-complete", "10-pc", new SpeciesFormChangeManualTrigger(), true)
   ],
   [Species.DIANCIE]: [
     new SpeciesFormChange(Species.DIANCIE, "", SpeciesFormKey.MEGA, new SpeciesFormChangeItemTrigger(FormChangeItem.DIANCITE))
diff --git a/src/data/pokemon-species.ts b/src/data/pokemon-species.ts
index 8bb23cfc208..eb1b761e306 100644
--- a/src/data/pokemon-species.ts
+++ b/src/data/pokemon-species.ts
@@ -425,6 +425,7 @@ export abstract class PokemonSpeciesForm {
       case "hero":
       case "roaming":
       case "complete":
+      case "10-complete":
       case "10":
       case "10-pc":
       case "super":
@@ -2135,7 +2136,8 @@ export function initSpecies() {
       new PokemonForm("10% Forme", "10", Type.DRAGON, Type.GROUND, 1.2, 33.5, Abilities.AURA_BREAK, Abilities.NONE, Abilities.NONE, 486, 54, 100, 71, 61, 85, 115, 3, 0, 300, false, null, true),
       new PokemonForm("50% Forme Power Construct", "50-pc", Type.DRAGON, Type.GROUND, 5, 305, Abilities.POWER_CONSTRUCT, Abilities.NONE, Abilities.NONE, 600, 108, 100, 121, 81, 95, 95, 3, 0, 300, false, "", true),
       new PokemonForm("10% Forme Power Construct", "10-pc", Type.DRAGON, Type.GROUND, 1.2, 33.5, Abilities.POWER_CONSTRUCT, Abilities.NONE, Abilities.NONE, 486, 54, 100, 71, 61, 85, 115, 3, 0, 300, false, "10", true),
-      new PokemonForm("Complete Forme", "complete", Type.DRAGON, Type.GROUND, 4.5, 610, Abilities.POWER_CONSTRUCT, Abilities.NONE, Abilities.NONE, 708, 216, 100, 121, 91, 95, 85, 3, 0, 300),
+      new PokemonForm("Complete Forme (50% PC)", "complete", Type.DRAGON, Type.GROUND, 4.5, 610, Abilities.POWER_CONSTRUCT, Abilities.NONE, Abilities.NONE, 708, 216, 100, 121, 91, 95, 85, 3, 0, 300),
+      new PokemonForm("Complete Forme (10% PC)", "10-complete", Type.DRAGON, Type.GROUND, 4.5, 610, Abilities.POWER_CONSTRUCT, Abilities.NONE, Abilities.NONE, 708, 216, 100, 121, 91, 95, 85, 3, 0, 300, false, "complete"),
     ),
     new PokemonSpecies(Species.DIANCIE, 6, false, false, true, "Jewel Pokémon", Type.ROCK, Type.FAIRY, 0.7, 8.8, Abilities.CLEAR_BODY, Abilities.NONE, Abilities.NONE, 600, 50, 100, 150, 100, 150, 50, 3, 50, 300, GrowthRate.SLOW, null, false, true,
       new PokemonForm("Normal", "", Type.ROCK, Type.FAIRY, 0.7, 8.8, Abilities.CLEAR_BODY, Abilities.NONE, Abilities.NONE, 600, 50, 100, 150, 100, 150, 50, 3, 50, 300, false, null, true),
diff --git a/src/test/abilities/power_construct.test.ts b/src/test/abilities/power_construct.test.ts
index 662f5d06258..1a9e7d4818a 100644
--- a/src/test/abilities/power_construct.test.ts
+++ b/src/test/abilities/power_construct.test.ts
@@ -32,7 +32,7 @@ describe("Abilities - POWER CONSTRUCT", () => {
   });
 
   test(
-    "check if fainted pokemon switches to base form on arena reset",
+    "check if fainted 50% Power Construct Pokemon switches to base form on arena reset",
     async () => {
       const baseForm = 2,
         completeForm = 4;
@@ -41,7 +41,37 @@ describe("Abilities - POWER CONSTRUCT", () => {
         [Species.ZYGARDE]: completeForm,
       });
 
-      await game.startBattle([ Species.MAGIKARP, Species.ZYGARDE ]);
+      await game.classicMode.startBattle([ Species.MAGIKARP, Species.ZYGARDE ]);
+
+      const zygarde = game.scene.getParty().find((p) => p.species.speciesId === Species.ZYGARDE);
+      expect(zygarde).not.toBe(undefined);
+      expect(zygarde!.formIndex).toBe(completeForm);
+
+      zygarde!.hp = 0;
+      zygarde!.status = new Status(StatusEffect.FAINT);
+      expect(zygarde!.isFainted()).toBe(true);
+
+      game.move.select(Moves.SPLASH);
+      await game.doKillOpponents();
+      await game.phaseInterceptor.to(TurnEndPhase);
+      game.doSelectModifier();
+      await game.phaseInterceptor.to(QuietFormChangePhase);
+
+      expect(zygarde!.formIndex).toBe(baseForm);
+    },
+  );
+
+  test(
+    "check if fainted 10% Power Construct Pokemon switches to base form on arena reset",
+    async () => {
+      const baseForm = 3,
+        completeForm = 5;
+      game.override.startingWave(4);
+      game.override.starterForms({
+        [Species.ZYGARDE]: completeForm,
+      });
+
+      await game.classicMode.startBattle([ Species.MAGIKARP, Species.ZYGARDE ]);
 
       const zygarde = game.scene.getParty().find((p) => p.species.speciesId === Species.ZYGARDE);
       expect(zygarde).not.toBe(undefined);