diff --git a/src/data/battler-tags.ts b/src/data/battler-tags.ts
index 56f6b804b30..63d6ee3205e 100644
--- a/src/data/battler-tags.ts
+++ b/src/data/battler-tags.ts
@@ -2186,11 +2186,11 @@ export class HealBlockTag extends BattlerTag {
     super(BattlerTagType.HEAL_BLOCK, BattlerTagLapseType.TURN_END, 5, Moves.HEAL_BLOCK);
   }
 
-  onAdd(pokemon: Pokemon): void {
+  override onAdd(pokemon: Pokemon): void {
     super.onAdd(pokemon);
   }
 
-  lapse(pokemon: Pokemon, lapseType: BattlerTagLapseType): boolean {
+  override lapse(pokemon: Pokemon, lapseType: BattlerTagLapseType): boolean {
     return super.lapse(pokemon, lapseType);
   }
 
@@ -2198,7 +2198,7 @@ export class HealBlockTag extends BattlerTag {
     return i18next.t("battle:battlerTagsHealBlock", { pokemonNameWithAffix: getPokemonNameWithAffix(pokemon) });
   }
 
-  onRemove(pokemon: Pokemon): void {
+  override onRemove(pokemon: Pokemon): void {
     super.onRemove(pokemon);
 
     pokemon.scene.queueMessage(i18next.t("battle:battlerTagsHealBlockOnRemove", { pokemonNameWithAffix: getPokemonNameWithAffix(pokemon) }), null, false, null);
diff --git a/src/phases/pokemon-heal-phase.ts b/src/phases/pokemon-heal-phase.ts
index 49db2641e98..813d15ae87e 100644
--- a/src/phases/pokemon-heal-phase.ts
+++ b/src/phases/pokemon-heal-phase.ts
@@ -10,6 +10,8 @@ import { HealAchv } from "#app/system/achv";
 import i18next from "i18next";
 import * as Utils from "#app/utils";
 import { CommonAnimPhase } from "./common-anim-phase";
+import { BattlerTagType } from "#app/enums/battler-tag-type";
+import { HealBlockTag } from "#app/data/battler-tags";
 
 export class PokemonHealPhase extends CommonAnimPhase {
   private hpHealed: integer;
@@ -50,9 +52,14 @@ export class PokemonHealPhase extends CommonAnimPhase {
 
     const hasMessage = !!this.message;
     const healOrDamage = (!pokemon.isFullHp() || this.hpHealed < 0);
+    const healBlock = pokemon.getTag(BattlerTagType.HEAL_BLOCK) as HealBlockTag;
     let lastStatusEffect = StatusEffect.NONE;
 
-    if (healOrDamage) {
+    if (healBlock && this.hpHealed > 0) {
+      this.scene.queueMessage(healBlock.onActivation(pokemon));
+      this.message = null;
+      super.end();
+    } else if (healOrDamage) {
       const hpRestoreMultiplier = new Utils.IntegerHolder(1);
       if (!this.revive) {
         this.scene.applyModifiers(HealingBoosterModifier, this.player, hpRestoreMultiplier);
diff --git a/src/test/moves/heal_block.test.ts b/src/test/moves/heal_block.test.ts
new file mode 100644
index 00000000000..8549d6211a9
--- /dev/null
+++ b/src/test/moves/heal_block.test.ts
@@ -0,0 +1,153 @@
+import { BattlerIndex } from "#app/battle";
+import { ArenaTagSide } from "#app/data/arena-tag";
+import { WeatherType } from "#app/data/weather";
+import GameManager from "#app/test/utils/gameManager";
+import { Abilities } from "#enums/abilities";
+import { ArenaTagType } from "#enums/arena-tag-type";
+import { BattlerTagType } from "#enums/battler-tag-type";
+import { Moves } from "#enums/moves";
+import { Species } from "#enums/species";
+import Phaser from "phaser";
+import { afterEach, beforeAll, beforeEach, describe, expect, it } from "vitest";
+
+const TIMEOUT = 20 * 1000;
+
+// Bulbapedia Reference: https://bulbapedia.bulbagarden.net/wiki/Heal_Block_(move)
+describe("Moves - Heal Block", () => {
+  let phaserGame: Phaser.Game;
+  let game: GameManager;
+
+  beforeAll(() => {
+    phaserGame = new Phaser.Game({
+      type: Phaser.HEADLESS,
+    });
+  });
+
+  afterEach(() => {
+    game.phaseInterceptor.restoreOg();
+  });
+
+  beforeEach(() => {
+    game = new GameManager(phaserGame);
+    game.override
+      .moveset([Moves.ABSORB, Moves.WISH, Moves.SPLASH, Moves.AQUA_RING])
+      .enemyMoveset(Moves.HEAL_BLOCK)
+      .ability(Abilities.NO_GUARD)
+      .enemyAbility(Abilities.BALL_FETCH)
+      .enemySpecies(Species.BLISSEY)
+      .disableCrits();
+  });
+
+  it("shouldn't stop damage from HP-drain attacks, just HP restoration", async() => {
+
+    await game.classicMode.startBattle([Species.CHARIZARD]);
+
+    const player = game.scene.getPlayerPokemon()!;
+    const enemy = game.scene.getEnemyPokemon()!;
+
+    player.damageAndUpdate(enemy.getMaxHp() - 1);
+
+    game.move.select(Moves.ABSORB);
+    await game.setTurnOrder([BattlerIndex.ENEMY, BattlerIndex.PLAYER]);
+    await game.phaseInterceptor.to("TurnEndPhase");
+
+    expect(player.hp).toBe(1);
+    expect(enemy.hp).toBeLessThan(enemy.getMaxHp());
+  }, TIMEOUT
+  );
+
+  it("shouldn't stop Liquid Ooze from dealing damage", async() => {
+    game.override.enemyAbility(Abilities.LIQUID_OOZE);
+
+    await game.classicMode.startBattle([Species.CHARIZARD]);
+
+    const player = game.scene.getPlayerPokemon()!;
+    const enemy = game.scene.getEnemyPokemon()!;
+
+    game.move.select(Moves.ABSORB);
+    await game.setTurnOrder([BattlerIndex.ENEMY, BattlerIndex.PLAYER]);
+    await game.phaseInterceptor.to("TurnEndPhase");
+
+    expect(player.isFullHp()).toBe(false);
+    expect(enemy.isFullHp()).toBe(false);
+  }, TIMEOUT);
+
+  it("should stop delayed heals, such as from Wish", async() => {
+    await game.classicMode.startBattle([Species.CHARIZARD]);
+
+    const player = game.scene.getPlayerPokemon()!;
+
+    player.damageAndUpdate(player.getMaxHp() - 1);
+
+    game.move.select(Moves.WISH);
+    await game.phaseInterceptor.to("TurnEndPhase");
+
+    expect(game.scene.arena.getTagOnSide(ArenaTagType.WISH, ArenaTagSide.PLAYER)).toBeDefined();
+    while (game.scene.arena.getTagOnSide(ArenaTagType.WISH, ArenaTagSide.PLAYER)) {
+      game.move.select(Moves.SPLASH);
+      await game.phaseInterceptor.to("TurnEndPhase");
+    }
+
+    expect(player.hp).toBe(1);
+  }, TIMEOUT);
+
+  it("should prevent Grassy Terrain from restoring HP", async() => {
+    game.override.enemyAbility(Abilities.GRASSY_SURGE);
+
+    await game.classicMode.startBattle([Species.CHARIZARD]);
+
+    const player = game.scene.getPlayerPokemon()!;
+
+    player.damageAndUpdate(player.getMaxHp() - 1);
+
+    game.move.select(Moves.SPLASH);
+    await game.phaseInterceptor.to("TurnEndPhase");
+
+    expect(player.hp).toBe(1);
+  }, TIMEOUT);
+
+  it("should prevent healing from heal-over-time moves", async() => {
+    await game.classicMode.startBattle([Species.CHARIZARD]);
+
+    const player = game.scene.getPlayerPokemon()!;
+
+    player.damageAndUpdate(player.getMaxHp() - 1);
+
+    game.move.select(Moves.AQUA_RING);
+    await game.phaseInterceptor.to("TurnEndPhase");
+
+    expect(player.getTag(BattlerTagType.AQUA_RING)).toBeDefined();
+    expect(player.hp).toBe(1);
+  }, TIMEOUT);
+
+  it("should prevent abilities from restoring HP", async() => {
+    game.override
+      .weather(WeatherType.RAIN)
+      .ability(Abilities.RAIN_DISH);
+
+    await game.classicMode.startBattle([Species.CHARIZARD]);
+
+    const player = game.scene.getPlayerPokemon()!;
+
+    player.damageAndUpdate(player.getMaxHp() - 1);
+
+    game.move.select(Moves.SPLASH);
+    await game.phaseInterceptor.to("TurnEndPhase");
+
+    expect(player.hp).toBe(1);
+  }, TIMEOUT);
+
+  it("should stop healing from items", async() => {
+    game.override.startingHeldItems([{name: "LEFTOVERS"}]);
+
+    await game.classicMode.startBattle([Species.CHARIZARD]);
+
+    const player = game.scene.getPlayerPokemon()!;
+    player.damageAndUpdate(player.getMaxHp() - 1);
+
+    game.move.select(Moves.SPLASH);
+    await game.phaseInterceptor.to("TurnEndPhase");
+
+    expect(player.hp).toBe(1);
+  }, TIMEOUT);
+});