Secret Dinosaurs are super powerful dinosaurs that can come from any branch of dinosaurs (there is no pattern). They seem to be selected mostly because of their fame or the presence of a unique or obvious feature. The known Secret Dinosaurs are Pachycephalosaurus, Therizinosaurus, Deinonychus, Megalosaurus, Brontosaurus, Cryolophosaurus, Eoraptor and Pawpawsaurus.
All Secret Dinosaurs have erasable ink over the images in their second arcade series cards, as well as on their names. Their Moves feature rainbow glows (except for Pawpawsaurus, who has pink hearts) and are stronger than most other Moves. Their TCG abilities are as varied as the dinosaurs belonging to the Element, though several involve placing the same restriction both on the opponent and the player using the dinosaur.
In the animeEdit
It can be noted that the question mark in the back of the dinosaur card does not exist; instead, it merely has the starburst and rainbow lights behind it.
The Secret Dinosaurs are the 7th attribute, but there is no stone tablet of this element. The element was created by Dr. Z when he first altered his Pachycephalosaurus. The Secret Dinosaurs emit a rainbow aura from their bodies that can be blindingly bright at times and are already equipped with their own Move Cards. They are activated by sunlight reflecting or refracting off or through something, or by any array of multicolored lights. Pawpawsaurus (as a Secret Dinosaur) and Eoraptor have never appeared in the anime, although Pawpawsaurus's Move Card form did appear.
Each Secret Dinosaur (except Eoraptor) has three unique Super Moves that only it can use, as none of them have separate cards. In the arcade game, these Moves each have a corresponding Rock-Paper-Scissors sign (1 with each of the three signs for each dinosaur), and are unlocked by the player swiping a Normal Move Card with the corresponding sign that indicates a Technique requirement (e.g. Tail Smash needs 200 Technique, Atomic Bomb needs 500, etc.). Secret Moves seem to activate randomly without strict "win/lose/tie with X" requirements.
In the anime, their Moves are inherent abilities they can activate on their own or on command, dialogue suggesting that at least some had their cards fused with Move Cards, explaining their cards' grey-yellow gradient design, though most only display the ability to use 1-2 of their Moves. In the TCG, Secret Dinosaurs can use Super Moves of any Element so long as they meet any other requirements listed on the card.
All Secret Moves for a dinosaur have a central theme relating to that dinosaur. Pachycephalosaurus' Moves involve using its thick head dome, and Therizinosaurus' involve its huge claws. Fossil evidence suggests Deinonychus may have been a pack hunter, so its Moves revolve around teamwork between members of a pack. Cryolophosaurus was discovered in Antarctica, hence its ice-themed Moves. Brontosaurus' name means "thundering lizard", so its Moves seem electricity-based (despite the fact that the dinosaur also has a Water Dinosaur form). For an unclear reason, Megalosaurus' Moves are based on telekinesis. Pawpawsaurus' Moves are based around teamwork between members of a Pawpawsaurus family (potentially because "Pawpaw" sounds like "papa" and the main Pawpawsaurus seems to have the role of the father, although this phonetic similarity might not exist in Japanese). And as one of the earliest dinosaurs, Eoraptor has the ability to "evolve" into a later dinosaur from each of the 6 other Elements.
|p · e · t||Secret Dinosaurs|
|Normal:||Brontosaurus · Cryolophosaurus · Deinonychus · Eoraptor · Megalosaurus · Pachycephalosaurus · Pawpawsaurus · Therizinosaurus|
|Main:||Bronto · Cryolophosaurus|
|Altered/Armored:||Brontosaurus/Armor · Deinonychus/Armor · Therizinosaurus/Super|