How to Beat the Final Boss - Ancient Sirehound Guide

Ancient Sirehound is the final boss in Pikmin 4 located in the last sublevel of Cavern for a King. Learn Ancient Sirehounds' location, the recommended Pikmin to use against it, how to beat it, as well as its weight and sparklium value in this guide!

Recommendations Against Ancient Sirehound

Recommended Pikmin

Recommended Pikmin
Red Pikmin	Yellow Pikmin	Purple Pikmin

Purple Pikmin make it easier to topple Ancient Sirehound, only needing 2 to weigh down its tail. Bring along Yellow Pikmin to destroy the shock orbs it summons on its third form. Finally, bring lots of Red Pikmin for damage and against its fourth form.

All Pikmin Types

Recommended Oatchi Skills

This is the final boss, so be sure to have Oatchi's skills upgraded! We recommend upgrading Rush to Mega Rush to quickly pull off this move when Ancient Sirehound has its belly exposed.

Big Chomp is optional but recommended! Upgrade this skill when you want our beloved space dog, along with our Pikmin, go toe-to-toe with the ancient doggo!

All Oatchi Skills

Recommended Gear and Items

Gear	Explanation
Thermal Defense For You | For Oatchi	Equip this gear to prevent you and Oatchi from getting frozen by Ancient Sirehound's attacks in its Ice Form.
Anti-Electrifier For You | For Oatchi	Equip this gear to prevent you and Oatchi from getting shocked by Ancient Sirehound's attacks in its Shock Form.
Scorch Guard For You | For Oatchi	Equip this gear to prevent you and Oatchi from getting burned by Ancient Sirehound's attacks in its Fire Form.
Ultra-Spicy Spray	This spray increases your movement speed, giving you and your Pikmin ample speed to dodge any of Ancient Sirehound's attacks.

Ancient Sirehound has different forms. Before starting the fight, make sure you have the proper gear against it! This will make the fight easier and much more manageable.

Note that with the items on, your Pikmin are still susceptible to certain effects. Always utilize your whistle to prevent them from getting eliminated!

While running around, be sure to use Ultra-Spicy Spray to get more movement speed in. With this item activated, Ancient Sirehound will certainly have trouble hitting you!

The Lab Guide

How to Beat Ancient Sirehound

Five Forms of Ancient Sirehound

Normal Form

This is the first form you will encounter Ancient Sirehound in. Its fur is in different shades of aqua. Its tail will be bright yellow all throughout the whole five forms.

Its moves consists of jumping high up and body slamming to the ground, which will make rock pillars drop from above. He can also charge at you, usually indicated by the Rescue Corps Officers text pop-up.

Ice Form

After defeating Ancient Sirehound in its normal form, it will shake its whole body to transform its fur into something that resembles ice.

Its moves consist of summoning snowballs that will roll around the arena and an Ice Beam capable of freezing you, Oatchi, and your Pikmin.

Shock Form

Defeating Ancient Sirehound in its Ice Form will transform it into its Shock Form. Its fur, now yellow, is seemingly induced with electricity. Getting too close to it while on this form will shock your Pikmin.

Fire Form

Ancient Sirehound's next transformation will change its fur from yellow to bright orange, emphasizing the power of fire it has.

To start the fight, it summons volatile fur balls around the arena. Then, it will shoot fireballs at you. Its final move is to stomp the ground, sending waves of fire around its body. The balls it summoned react to this, also creating waves of fire around its area.

Final Flying Form

This is Ancient Sirehound's final form. It will turn bright green and will spend most of its time flying.

It summons red, deadly puddles around the arena, which, in a single touch, can damage you and Oatchi and destroy your Pikmin. It can also fire this red substance in a straight line right at you, so its best to keep moving while fighting Ancient Sirehound in this form.

Steps to Beat Ancient Sirehound

Steps to Beat Ancient Sirehound
Step 1: Weigh Its Tail Down with Purple Pikmin Step 2: Hide Behind the Rock Pillars When It Charges Step 3: Get Behind It When It Uses Its Ice Beam Move Step 4: Destroy the Shock Orbs to Get to Its Tail Easier Step 5: Get Behind It When It's Stomping the Ground Step 6: Get Behind It After It Uses Its Red Beam

Weigh Its Tail Down with Purple Pikmin

Beating Ancient Sirehound requires you flip it over to attack its belly. To do this, target its tail and throw 15 Pikmin to weigh it down. We recommend throwing 2 Purple Pikmin to make this process quicker.

After it rolls over, use Rush to launch all of your Pikmin on its belly. Repeat until it's defeated. This is going to be the main strategy to beat Ancient Sirehound, so always go for the tail first!

Hide Behind the Rock Pillars When It Charges

During Ancient Sirehound's first form, it will jump and body slam you. The impact will cause rock pillars to drop from the ceiling.

Hide behind these pillars and when Ancient Sirehound rushes at you, the impact on the rock pillar will stun it long enough for you to get behind its back and topple it.

Get Behind It When It Uses Its Ice Beam Move

During Ancient Sirehound's Ice Form, you can only access the tail when it does its Ice Beam move. Quickly get behind it during this while also watching out for the rolling snowballs that it will summon.

Destroy the Shock Orbs to Get to Its Tail Easier

In its Shock Form, Ancient Sirehound's tail will only be accessible after it tilts its head up and summons surges of electricity around it. However, getting to the tail will get troublesome because of the yellow orbs it summons that can shock your Pikmin.

To deal with this, have the Yellow Pikmin destroy the orbs before Ancient Sirehound's surges attack.

Stay a Safe Distance, or Your Pikmin Will Get Shocked

When in its Shock Form, getting too close to Ancient Sirehound will shock your Pikmin, leaving them open to get disintegrated. Always stay a safe distance when fighting it in this form.

Get Behind It When It's Stomping the Ground

During this form, Ancient Sirehound's tail will only be accessible after it stomps the ground, summoning waves of fire underneath it. Quickly get behind it to get to the tail; this area will be your opening since no waves of fire will emanate here.

Destroy the Fiery Fur Balls Before It Does Its Stomp Move

Ancient Sirehound will also summon fiery fur balls that can also create fire waves when hit with the flames from its creator. Destroy these fur balls with the Red Pikmin first to make the ground easier to traverse.

Get Behind It After It Uses Its Red Beam

In its final form, Ancient Sirehound's tail can only be accessed after it fires a fissure-like red beam towards you. Traverse the arena carefully and get to that tail!

Stay Away from the Red Puddles

Similiar with Smoky Progg, this red puddle can instantly eliminate any Pikmin close to it. If you are not careful with your position, this puddle can possibly eliminate all of your army. Carefully move around these puddles!

Ancient Sirehound Basic Info and Location

Overview

Ancient Sirehound Overview
Family	Weight	Sparklium Value	Pikmin Yield
???	Unknown	Unknown	Unknown
Sci. Name	Deicanis perditum
Locations	▸Cavern for a King
Dalmo's Log	A coat that's dense and rough like a primeval forest, a stench like a wet canine, and a shockingly toasty body temperature... Clearly a dog in every sense. The long history of dogs being companions we can rely on triggers an instinctive reaction through our entire bodies! If I were left on this planet with this massive cutie, I'd be content!
Olimar's Log	If we harvest mesenchymal stem cells from this gigantic canine creature and cultivate them with glow sap, the generated serum should return Oatchi's leafified tail to normal once administered. These results would indicate that 99.9 percent of the canine creature's DNA matches Oatchi's, and that the only difference between Oatchi and Moss may be the natural presence or absence of a leaf tail. If these two theories prove to be true, it would suggest the possibility that this ancient creature is a common ancestor to two canine species from vastly remote star systems. And that, perhaps, there are even more hidden secrets out there that could hint at a fascinating yet inconceivable truth the universe has yet to reveal...
Louie's Log	The ultimate ride, plush and comfortable. I wish I could bring it home with me.

Ancient Sirehound Location

Ancient Sirehound is the final boss that can be encountered in the Cavern for a King cave located in Primordial Thicket. To unlock this cave, you need to have defeated Louie in the last Dandori Battle, Final Battle.

Final Battle Guide

Pikmin 4 Related Guides

List of All Bosses

List of All Bosses

Bosses
Empress Bulblax	Emperor Bulblax	Sovereign Bulblax
Horned Cannon Beetle	Arctic Cannon Beetle	Man-at-Legs
Groovy Long Legs	Snowfake Fluttertail	Giant Breadbug
Gildemander	Mammoth Snootwhacker	Foolix
Burrowing Snagret	Puffstool	Toxstool
Porquillion	Puffy Blowhog	Masterhop
Bug-Eyed Crawmad	Crusted Rumpup	Bloomcap Bloyster
Waterwraith	Smoky Progg	Ancient Sirehound