Giant Rock

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The Megalith Zygarde is an entity created by Lysandre in the anime, using the Megalith: an ancient, giant stone that contains massive amounts of Primal energy.

Biology

The Megalith Zygarde has roughly the same body shape as a 50% Zygarde, except it is much larger. Its upper body is primarily made out of stone, with a glowing red crystal serving as its "eye", whereas its lower body is composed out of vines. These vines also serve as a defense mechanism to protect the core body from attacks.

The Megalith Zygarde is partly hollow inside, with its "innards" being composed out of glowing red crystals, with Chespie, its power source, at the center. These red crystals will likewise grow and shift to serve as a defense mechanism for its energy source. Even after the power source is removed, Lysandre still managed to power up the Megalith Zygarde remotely using a control device coupled to his gauntlet. Due to its vast size and mindless nature, the Megalith Zygarde is extremely difficult to slow down, let alone defeat. In order to stop it, Steven, Diantha, Ash, Alain, Malva and Professor Sycamore, as well as Kalos' eight Gym Leaders, needed to have all their strongest Pokémon team up against it. Even then, after Lysandre powered it up again, Squishy and Z2 had to transform into a Complete Zygarde to stop it, and only managed to do so after Ash's Pikachu, Greninja and Alain's Charizard destroyed Lysandre's control device.

Plot

The Megalith first appeared in Mega Evolution Special II. Lysandre had his scientists research it, but Mega Rayquaza tried to attack them. Alain and Steven attempted to fend off the Legendary Pokémon, but the Megalith disappeared. During the events of Mega Evolution Special III, the Weather Trio battled over the Megalith, due to being attracted to it's massive amount of Primal energy. While Alain and Steven fought off Groudon and Kyogre, Lysandre managed to secure the giant stone. During the events of Mega Evolution Special IV, Chespie got hurt saving Squishy from Team Flare, causing it to radiate energy and enter a comatose state.

After this, the Megalith remained unmentioned until the events of XY135, where it was revealed that, in the case Team Flare lost control of the two Zygarde, Lysandre had planned for it to absorb Chespie and transform into a copy of Zygarde, which would collide with the Anistar City Sundial and release enough energy to wipe out all life on the planet. It was created when Serena, Mairin, Professor Sycamore and Team Rocket invaded Lysandre Labs, destroying the laboratory during its conception and forcing all Team Flare agents present to flee. It could not be stopped by Ash, Alain, Steven, Serena and their strongest Pokémon, although Ash-Greninja was able to sense Chespie's presence in the giant creature and marked it's location with a Water Shuriken. During XY136, the group was helped by all Kalos Gym Leaders, Diantha, and Malva. Together, they all helped clear or destroy some of the Megalith Zygarde's roots and pave the way for Ash, Alain and their Pokémon to enter Megalith Zygarde and rescue Chespie, depriving the Megalith Zygarde of its power source and rendering it inert. Lysandre ultimately had to personally power it back up using his control device, but in response Squishy and Z2 transformed into Zygarde Complete Forme, which was able to match Megalith Zygarde in combat. Although Lysandre attempted to fight back, he was defeated when Ash's Greninja, Pikachu and Alain's Charizard destroyed his control device, allowing Zygarde to attack the Megalith Zygarde with ExtremeSpeed, which made a massive hole in the Megalith Zygarde. It was then destroyed with Squishy's and Z2's Core Enforcer, an act that seemingly killed Lysandre, although his ultimate fate was left unclear.

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