- Species: Stegosaurus
- Attribute: Earth
- Power: 2000
- TCG: 2500
- Technique: 700
- Sign: Paper
- Owner: Foolscap (Spectral Space Pirates)
- Debut: All For One
- Dinosaurs Defeated: Tank, Spiny, Ace
- Other: It can use Spectral Stinger in this form. It is the only form Armatus is seen in in the anime.
- Spectral Stinger (Jark Stinger)
- Sharp spines grow from the Spectral Armor spikes on Armatus's sides and are then shot out at the opponent. This card defeated Ace, Spiny and Tank. It is very similar to the Earth Move, Spike Arrows.
- Earth Master
- This Dinosaur can use all Earth Super Moves.
- Spectral Quake
- At the end of each of your opponent's turns, they lose 2 Life Points.
He first appeared in All For One, assisting Ankylosaurus against Ace. Even when Chomp and Paris joined the battle, he and Ankylosaurus were too strong. When Chomp, Ace, and Paris combined their Ultimate Moves, Foolscap was told the location of the Green Cosmos Stone and recalled both his dinosaurs before the attack could hit them. Armatus later attacked the D-Team and Alpha Gang, but Jonathan rescued them.
He battled against Chomp in The Forest Fire Effect, using his move Spectral Stinger for the first time, but was recalled after the volcano errupted. He was frozen when fighting Cryolophosaurus in The Search for the Last Cosmos Stone.
In Clash for the Cosmos Stones he reappeared again, using Spectral Stinger to defeat Tank, Spiny, and Ace. He was also super charged by the Dark Pterosaur and battled the D-Team and Alpha Gang in the finale. He defeated Spiny again with Spectral Stinger, but he was defeated by the combined power of Chomp's Lightning Strike, Ace's Sonic Blast and Paris's Emerald Garden. What happened to his card after this isn't clear.
|p · e · t||Main Dinosaurs|
|D-Team:||Chomp (Max) · Ace (Rex) · Paris (Zoe)|
|Alpha Gang:||Terry · Spiny · Tank|
|Spectral Space Pirates:||Brontikens (Spectre) · Gigas (Gavro) · Armatus (Foolscap) · Maximus (Sheer) · Eocarcharia (Goma)|
|Others:||Saurophaganax (Seth) · Black Tyrannosaurus (Seth) · Cryolophosaurus (Seth)|
|p · e · t||Earth Dinosaurs|
|Normal:||Ankylosaurus · Dacentrurus · Edmontonia · Euoplocephalus · Gastonia · Gigantspinosaurus · Kentrosaurus · Lexovisaurus · Minmi · Nodosaurus · Panoplosaurus · Pinacosaurus · Polacanthus · Saichania · Sauropelta · Stegosaurus · Talarurus · Tarchia · Tuojiangosaurus · Wuerhosaurus|
|Altered/Armored:||Ankylosaurus/Alpha · Ankylosaurus/Armor · Armatus · Armatus/Armor · Edmontonia/Armor · Edmontonia/Super · Euoplocephalus/Armor · Kentrosaurus/Alpha · Lexovisaurus/Armor · Nodosaurus/Super · Saichania/Armor · Saichania/Black · Saichania/Super · Sauropelta/Alpha · Sauropelta/Super · Talarurus/Super · Tank/Super · Tarchia/Super · Tuojiangosaurus/Armor · Wuerhosaurus/Alpha|
|Main:||Tank · Armatus|