diff --git a/src/battle.ts b/src/battle.ts
index 5105418fd9c..07e520d6bc0 100644
--- a/src/battle.ts
+++ b/src/battle.ts
@@ -8,7 +8,6 @@ import {
   shiftCharCodes,
   randSeedItem,
   randInt,
-  randSeedFloat,
 } from "#app/utils/common";
 import Trainer, { TrainerVariant } from "./field/trainer";
 import type { GameMode } from "./game-mode";
@@ -151,7 +150,7 @@ export default class Battle {
   randSeedGaussForLevel(value: number): number {
     let rand = 0;
     for (let i = value; i > 0; i--) {
-      rand += randSeedFloat();
+      rand += Phaser.Math.RND.realInRange(0, 1);
     }
     return rand / value;
   }
diff --git a/src/data/abilities/ability.ts b/src/data/abilities/ability.ts
index ea1937579a6..f7c60316ccc 100644
--- a/src/data/abilities/ability.ts
+++ b/src/data/abilities/ability.ts
@@ -1,5 +1,5 @@
 import { HitResult, MoveResult, PlayerPokemon } from "#app/field/pokemon";
-import { BooleanHolder, NumberHolder, toDmgValue, isNullOrUndefined, randSeedItem, randSeedInt, type Constructor, randSeedFloat } from "#app/utils/common";
+import { BooleanHolder, NumberHolder, toDmgValue, isNullOrUndefined, randSeedItem, randSeedInt, type Constructor } from "#app/utils/common";
 import { getPokemonNameWithAffix } from "#app/messages";
 import { BattlerTagLapseType, GroundedTag } from "#app/data/battler-tags";
 import { getNonVolatileStatusEffects, getStatusEffectDescriptor, getStatusEffectHealText } from "#app/data/status-effect";
@@ -4073,7 +4073,7 @@ export class PostTurnRestoreBerryAbAttr extends PostTurnAbAttr {
     }
 
     // Clamp procChance to [0, 1]. Skip if didn't proc (less than pass)
-    const pass = randSeedFloat();
+    const pass = Phaser.Math.RND.realInRange(0, 1);
     return Phaser.Math.Clamp(this.procChance(pokemon), 0, 1) >= pass;
   }
 
diff --git a/src/data/moves/move.ts b/src/data/moves/move.ts
index 1b0e7c849ac..d27197b6f97 100644
--- a/src/data/moves/move.ts
+++ b/src/data/moves/move.ts
@@ -29,7 +29,7 @@ import {
 } from "../status-effect";
 import { getTypeDamageMultiplier } from "../type";
 import { PokemonType } from "#enums/pokemon-type";
-import { BooleanHolder, NumberHolder, isNullOrUndefined, toDmgValue, randSeedItem, randSeedInt, getEnumValues, toReadableString, type Constructor, randSeedFloat } from "#app/utils/common";
+import { BooleanHolder, NumberHolder, isNullOrUndefined, toDmgValue, randSeedItem, randSeedInt, getEnumValues, toReadableString, type Constructor } from "#app/utils/common";
 import { WeatherType } from "#enums/weather-type";
 import type { ArenaTrapTag } from "../arena-tag";
 import { ArenaTagSide, WeakenMoveTypeTag } from "../arena-tag";
@@ -2549,8 +2549,8 @@ export class StealHeldItemChanceAttr extends MoveEffectAttr {
   }
 
   apply(user: Pokemon, target: Pokemon, move: Move, args: any[]): boolean {
-    const rand = randSeedFloat();
-    if (rand > this.chance) {
+    const rand = Phaser.Math.RND.realInRange(0, 1);
+    if (rand >= this.chance) {
       return false;
     }
 
diff --git a/src/data/pokemon-species.ts b/src/data/pokemon-species.ts
index 7000523a50d..59167ba47f6 100644
--- a/src/data/pokemon-species.ts
+++ b/src/data/pokemon-species.ts
@@ -8,14 +8,7 @@ import type { AnySound } from "#app/battle-scene";
 import { globalScene } from "#app/global-scene";
 import type { GameMode } from "#app/game-mode";
 import { DexAttr, type StarterMoveset } from "#app/system/game-data";
-import {
-  isNullOrUndefined,
-  capitalizeString,
-  randSeedInt,
-  randSeedGauss,
-  randSeedItem,
-  randSeedFloat,
-} from "#app/utils/common";
+import { isNullOrUndefined, capitalizeString, randSeedInt, randSeedGauss, randSeedItem } from "#app/utils/common";
 import { uncatchableSpecies } from "#app/data/balance/biomes";
 import { speciesEggMoves } from "#app/data/balance/egg-moves";
 import { GrowthRate } from "#app/data/exp";
@@ -493,10 +486,10 @@ export abstract class PokemonSpeciesForm {
           break;
         case Species.ZACIAN:
         case Species.ZAMAZENTA:
+          // biome-ignore lint/suspicious/noFallthroughSwitchClause: Falls through
           if (formSpriteKey.startsWith("behemoth")) {
             formSpriteKey = "crowned";
           }
-          // biome-ignore lint/suspicious/no-fallthrough: Falls through
         default:
           ret += `-${formSpriteKey}`;
           break;
@@ -757,7 +750,7 @@ export abstract class PokemonSpeciesForm {
     let paletteColors: Map<number, number> = new Map();
 
     const originalRandom = Math.random;
-    Math.random = randSeedFloat;
+    Math.random = Phaser.Math.RND.frac;
 
     globalScene.executeWithSeedOffset(
       () => {
@@ -780,7 +773,6 @@ export default class PokemonSpecies extends PokemonSpeciesForm implements Locali
   readonly mythical: boolean;
   readonly species: string;
   readonly growthRate: GrowthRate;
-  /** The chance (as a decimal) for this Species to be male, or `null` for genderless species */
   readonly malePercent: number | null;
   readonly genderDiffs: boolean;
   readonly canChangeForm: boolean;
@@ -897,7 +889,7 @@ export default class PokemonSpecies extends PokemonSpeciesForm implements Locali
       return Gender.GENDERLESS;
     }
 
-    if (randSeedFloat() <= this.malePercent) {
+    if (Phaser.Math.RND.realInRange(0, 1) <= this.malePercent) {
       return Gender.MALE;
     }
     return Gender.FEMALE;
@@ -1146,7 +1138,7 @@ export default class PokemonSpecies extends PokemonSpeciesForm implements Locali
       }
     }
 
-    if (noEvolutionChance === 1 || randSeedFloat() <= noEvolutionChance) {
+    if (noEvolutionChance === 1 || Phaser.Math.RND.realInRange(0, 1) < noEvolutionChance) {
       return this.speciesId;
     }
 
diff --git a/src/field/pokemon.ts b/src/field/pokemon.ts
index de08d7dfac7..c06dae1e760 100644
--- a/src/field/pokemon.ts
+++ b/src/field/pokemon.ts
@@ -54,7 +54,7 @@ import {
   getStarterValueFriendshipCap,
   speciesStarterCosts,
 } from "#app/data/balance/starters";
-import { NumberHolder, randSeedInt, getIvsFromId, BooleanHolder, randSeedItem, isNullOrUndefined, getEnumValues, toDmgValue, fixedInt, rgbaToInt, rgbHexToRgba, rgbToHsv, deltaRgb, isBetween, type nil, type Constructor, randSeedFloat } from "#app/utils/common";
+import { NumberHolder, randSeedInt, getIvsFromId, BooleanHolder, randSeedItem, isNullOrUndefined, getEnumValues, toDmgValue, fixedInt, rgbaToInt, rgbHexToRgba, rgbToHsv, deltaRgb, isBetween, type nil, type Constructor } from "#app/utils/common";
 import type { TypeDamageMultiplier } from "#app/data/type";
 import { getTypeDamageMultiplier, getTypeRgb } from "#app/data/type";
 import { PokemonType } from "#enums/pokemon-type";
@@ -6047,7 +6047,7 @@ export default abstract class Pokemon extends Phaser.GameObjects.Container {
     let fusionPaletteColors: Map<number, number>;
 
     const originalRandom = Math.random;
-    Math.random = () => randSeedFloat();
+    Math.random = () => Phaser.Math.RND.realInRange(0, 1);
 
     globalScene.executeWithSeedOffset(
       () => {
diff --git a/src/modifier/modifier.ts b/src/modifier/modifier.ts
index 514e03a8aa8..4adb46dc47a 100644
--- a/src/modifier/modifier.ts
+++ b/src/modifier/modifier.ts
@@ -15,7 +15,7 @@ import { PokemonHealPhase } from "#app/phases/pokemon-heal-phase";
 import type { VoucherType } from "#app/system/voucher";
 import { Command } from "#app/ui/command-ui-handler";
 import { addTextObject, TextStyle } from "#app/ui/text";
-import { BooleanHolder, hslToHex, isNullOrUndefined, NumberHolder, randSeedFloat, toDmgValue } from "#app/utils/common";
+import { BooleanHolder, hslToHex, isNullOrUndefined, NumberHolder, toDmgValue } from "#app/utils/common";
 import { BattlerTagType } from "#enums/battler-tag-type";
 import { BerryType } from "#enums/berry-type";
 import type { Moves } from "#enums/moves";
@@ -3367,7 +3367,7 @@ export class ContactHeldItemTransferChanceModifier extends HeldItemTransferModif
   }
 
   getTransferredItemCount(): number {
-    return randSeedFloat() <= this.chance * this.getStackCount() ? 1 : 0;
+    return Phaser.Math.RND.realInRange(0, 1) < this.chance * this.getStackCount() ? 1 : 0;
   }
 
   getTransferMessage(pokemon: Pokemon, targetPokemon: Pokemon, item: ModifierType): string {
@@ -3645,7 +3645,7 @@ export class EnemyAttackStatusEffectChanceModifier extends EnemyPersistentModifi
    * @returns `true` if the {@linkcode Pokemon} was affected
    */
   override apply(enemyPokemon: Pokemon): boolean {
-    if (randSeedFloat() <= this.chance * this.getStackCount()) {
+    if (Phaser.Math.RND.realInRange(0, 1) < this.chance * this.getStackCount()) {
       return enemyPokemon.trySetStatus(this.effect, true);
     }
 
@@ -3685,16 +3685,16 @@ export class EnemyStatusEffectHealChanceModifier extends EnemyPersistentModifier
    * @returns `true` if the {@linkcode Pokemon} was healed
    */
   override apply(enemyPokemon: Pokemon): boolean {
-    if (!enemyPokemon.status || randSeedFloat() > this.chance * this.getStackCount()) {
-      return false;
+    if (enemyPokemon.status && Phaser.Math.RND.realInRange(0, 1) < this.chance * this.getStackCount()) {
+      globalScene.queueMessage(
+        getStatusEffectHealText(enemyPokemon.status.effect, getPokemonNameWithAffix(enemyPokemon)),
+      );
+      enemyPokemon.resetStatus();
+      enemyPokemon.updateInfo();
+      return true;
     }
 
-    globalScene.queueMessage(
-      getStatusEffectHealText(enemyPokemon.status.effect, getPokemonNameWithAffix(enemyPokemon)),
-    );
-    enemyPokemon.resetStatus();
-    enemyPokemon.updateInfo();
-    return true;
+    return false;
   }
 
   getMaxStackCount(): number {
@@ -3773,7 +3773,7 @@ export class EnemyFusionChanceModifier extends EnemyPersistentModifier {
    * @returns `true` if the {@linkcode EnemyPokemon} is a fusion
    */
   override apply(isFusion: BooleanHolder): boolean {
-    if (randSeedFloat() > this.chance * this.getStackCount()) {
+    if (Phaser.Math.RND.realInRange(0, 1) >= this.chance * this.getStackCount()) {
       return false;
     }
 
diff --git a/src/utils/common.ts b/src/utils/common.ts
index 4b493f637e3..847f8a7ecdb 100644
--- a/src/utils/common.ts
+++ b/src/utils/common.ts
@@ -57,8 +57,8 @@ export function randSeedGauss(stdev: number, mean = 0): number {
   if (!stdev) {
     return 0;
   }
-  const u = 1 - randSeedFloat();
-  const v = randSeedFloat();
+  const u = 1 - Phaser.Math.RND.realInRange(0, 1);
+  const v = Phaser.Math.RND.realInRange(0, 1);
   const z = Math.sqrt(-2.0 * Math.log(u)) * Math.cos(2.0 * Math.PI * v);
   return z * stdev + mean;
 }
@@ -87,9 +87,9 @@ export function randInt(range: number, min = 0): number {
 }
 
 /**
- * Generate a random integer using the global seed, or the current battle's seed if called via `Battle.randSeedInt`
- * @param range - How large of a range of random numbers to choose from. If {@linkcode range} <= 1, returns {@linkcode min}
- * @param min - The minimum integer to pick, default `0`
+ * Generates a random number using the global seed, or the current battle's seed if called via `Battle.randSeedInt`
+ * @param range How large of a range of random numbers to choose from. If {@linkcode range} <= 1, returns {@linkcode min}
+ * @param min The minimum integer to pick, default `0`
  * @returns A random integer between {@linkcode min} and ({@linkcode min} + {@linkcode range} - 1)
  */
 export function randSeedInt(range: number, min = 0): number {
@@ -108,14 +108,6 @@ export function randIntRange(min: number, max: number): number {
   return randInt(max - min, min);
 }
 
-/**
- * Generate and return a random real number between `0` and `1` using the global seed.
- * @returns A random floating-point number between `0` and `1`
- */
-export function randSeedFloat(): number {
-  return Phaser.Math.RND.frac();
-}
-
 export function randItem<T>(items: T[]): T {
   return items.length === 1 ? items[0] : items[randInt(items.length)];
 }
@@ -510,19 +502,12 @@ export function capitalizeString(str: string, sep: string, lowerFirstChar = true
   return null;
 }
 
-/**
- * Report whether a given value is nullish (`null`/`undefined`).
- * @param val - The value whose nullishness is being checked
- * @returns `true` if `val` is either `null` or `undefined`
- */
-export function isNullOrUndefined(val: any): val is null | undefined {
-  return val === null || val === undefined;
+export function isNullOrUndefined(object: any): object is null | undefined {
+  return object === null || object === undefined;
 }
 
 /**
- * Capitalize the first letter of a string.
- * @param str - The string whose first letter is being capitalized
- * @return The original string with its first letter capitalized
+ * Capitalizes the first letter of a string
  */
 export function capitalizeFirstLetter(str: string) {
   return str.charAt(0).toUpperCase() + str.slice(1);