diff --git a/src/data/battler-tags.ts b/src/data/battler-tags.ts
index 25567b83c27..1244d8697e6 100644
--- a/src/data/battler-tags.ts
+++ b/src/data/battler-tags.ts
@@ -827,7 +827,7 @@ export class SlowStartTag extends AbilityBattlerTag {
   }
 
   lapse(pokemon: Pokemon, lapseType: BattlerTagLapseType): boolean {
-    if (pokemon.getAbility().id !== this.ability && (pokemon.canApplyAbility(true) && pokemon.getPassiveAbility().id !== this.ability))
+    if ((!pokemon.canApplyAbility() || pokemon.getAbility().id !== this.ability) && (!pokemon.canApplyAbility(true) || pokemon.getPassiveAbility().id !== this.ability))
       this.turnCount = 1;
 
     return super.lapse(pokemon, lapseType);
diff --git a/src/data/move.ts b/src/data/move.ts
index 2ea99430211..2ba34d488fd 100644
--- a/src/data/move.ts
+++ b/src/data/move.ts
@@ -4505,9 +4505,9 @@ export function initMoves() {
       .attr(StatChangeAttr, [ BattleStat.SPATK, BattleStat.SPDEF, BattleStat.SPD ], 2, true)
       .ignoresVirtual(),
     new StatusMove(Moves.MAGNETIC_FLUX, "Magnetic Flux", Type.ELECTRIC, -1, 20, "The user manipulates magnetic fields, which raises the Defense and Sp. Def stats of ally Pokémon with the Plus or Minus Ability.", -1, 0, 6)
-      .attr(StatChangeAttr, [ BattleStat.DEF, BattleStat.SPDEF ], 1, false, (user, target, move) => !![ Abilities.PLUS, Abilities.MINUS].find(a => a === user.getAbility().id || (user.canApplyAbility(true) && a === user.getPassiveAbility().id)))
+      .attr(StatChangeAttr, [ BattleStat.DEF, BattleStat.SPDEF ], 1, false, (user, target, move) => !![ Abilities.PLUS, Abilities.MINUS].find(a => a === user.getAbility().id || (user.canApplyPassive() && a === user.getPassiveAbility().id)))
       .target(MoveTarget.USER_AND_ALLIES)
-      .condition((user, target, move) => !![ user, user.getAlly() ].filter(p => p?.isActive()).find(p => !![ Abilities.PLUS, Abilities.MINUS].find(a => a === p.getAbility().id || (user.canApplyAbility(true) && a === user.getPassiveAbility().id)))),
+      .condition((user, target, move) => !![ user, user.getAlly() ].filter(p => p?.isActive()).find(p => !![ Abilities.PLUS, Abilities.MINUS].find(a => a === p.getAbility().id || (user.canApplyPassive() && a === user.getPassiveAbility().id)))),
     new StatusMove(Moves.HAPPY_HOUR, "Happy Hour (N)", Type.NORMAL, -1, 30, "Using Happy Hour doubles the amount of prize money received after battle.", -1, 0, 6) // No animation
       .target(MoveTarget.USER_SIDE),
     new StatusMove(Moves.ELECTRIC_TERRAIN, "Electric Terrain", Type.ELECTRIC, -1, 10, "The user electrifies the ground for five turns, powering up Electric-type moves. Pokémon on the ground no longer fall asleep.", -1, 0, 6)
@@ -4632,9 +4632,9 @@ export function initMoves() {
       .attr(StatChangeAttr, BattleStat.SPD, -1),
     new SelfStatusMove(Moves.LASER_FOCUS, "Laser Focus (N)", Type.NORMAL, -1, 30, "The user concentrates intensely. The attack on the next turn always results in a critical hit.", -1, 0, 7),
     new StatusMove(Moves.GEAR_UP, "Gear Up", Type.STEEL, -1, 20, "The user engages its gears to raise the Attack and Sp. Atk stats of ally Pokémon with the Plus or Minus Ability.", -1, 0, 7)
-      .attr(StatChangeAttr, [ BattleStat.ATK, BattleStat.SPATK ], 1, false, (user, target, move) => [ Abilities.PLUS, Abilities.MINUS ].includes(target.getAbility().id) || (target.canApplyAbility(true) && [ Abilities.PLUS, Abilities.MINUS ].includes(target.getPassiveAbility().id)))
+      .attr(StatChangeAttr, [ BattleStat.ATK, BattleStat.SPATK ], 1, false, (user, target, move) => [ Abilities.PLUS, Abilities.MINUS ].includes(target.getAbility().id) || (target.canApplyPassive() && [ Abilities.PLUS, Abilities.MINUS ].includes(target.getPassiveAbility().id)))
       .target(MoveTarget.USER_AND_ALLIES)
-      .condition((user, target, move) => !![ user, user.getAlly() ].find(p => p && [ Abilities.PLUS, Abilities.MINUS ].includes(p.getAbility().id) || (target.canApplyAbility(true) && [ Abilities.PLUS, Abilities.MINUS ].includes(target.getPassiveAbility().id)))),
+      .condition((user, target, move) => !![ user, user.getAlly() ].find(p => p && [ Abilities.PLUS, Abilities.MINUS ].includes(p.getAbility().id) || (target.canApplyPassive() && [ Abilities.PLUS, Abilities.MINUS ].includes(target.getPassiveAbility().id)))),
     new AttackMove(Moves.THROAT_CHOP, "Throat Chop (P)", Type.DARK, MoveCategory.PHYSICAL, 80, 100, 15, "The user attacks the target's throat, and the resultant suffering prevents the target from using moves that emit sound for two turns.", 100, 0, 7),
     new AttackMove(Moves.POLLEN_PUFF, "Pollen Puff (P)", Type.BUG, MoveCategory.SPECIAL, 90, 100, 15, "The user attacks the enemy with a pollen puff that explodes. If the target is an ally, it gives the ally a pollen puff that restores its HP instead.", -1, 0, 7)
       .ballBombMove(),
diff --git a/src/data/weather.ts b/src/data/weather.ts
index cf3cf3434ea..b3a59f34b98 100644
--- a/src/data/weather.ts
+++ b/src/data/weather.ts
@@ -106,9 +106,9 @@ export class Weather {
     const field = scene.getField(true);
 
     for (let pokemon of field) {
-      let suppressWeatherEffectAbAttr = pokemon.canApplyAbility(false) ? pokemon.getAbility().getAttrs(SuppressWeatherEffectAbAttr).find(() => true) as SuppressWeatherEffectAbAttr : null;
+      let suppressWeatherEffectAbAttr = pokemon.getAbility().getAttrs(SuppressWeatherEffectAbAttr).find(() => true) as SuppressWeatherEffectAbAttr;
       if (!suppressWeatherEffectAbAttr)
-        suppressWeatherEffectAbAttr = pokemon.canApplyAbility(true) ? pokemon.getPassiveAbility().getAttrs(SuppressWeatherEffectAbAttr).find(() => true) as SuppressWeatherEffectAbAttr : null;
+        suppressWeatherEffectAbAttr = pokemon.canApplyPassive() ? pokemon.getPassiveAbility().getAttrs(SuppressWeatherEffectAbAttr).find(() => true) as SuppressWeatherEffectAbAttr : null;
       if (suppressWeatherEffectAbAttr && (!this.isImmutable() || suppressWeatherEffectAbAttr.affectsImmutable))
         return true;
     }
diff --git a/src/field/pokemon.ts b/src/field/pokemon.ts
index 8b18edeabf9..1cc4378ead5 100644
--- a/src/field/pokemon.ts
+++ b/src/field/pokemon.ts
@@ -724,8 +724,12 @@ export default abstract class Pokemon extends Phaser.GameObjects.Container {
     return allAbilities[starterPassiveAbilities[starterSpeciesId]];
   }
 
+  canApplyPassive(): boolean {
+    return this.isBoss();
+  }
+
   canApplyAbility(passive: boolean = false): boolean {
-    if (passive)
+    if (passive && !this.canApplyPassive())
       return false;
     const ability = (!passive ? this.getAbility() : this.getPassiveAbility());
     if (ability.isIgnorable && this.scene.arena.ignoreAbilities)