Emeritero dot the shorelines of the vast desert continents, filter-feeding with their feathery antennae as sludgy waves thick with minerals and microorganisms crash over them. They spend much of their time buried under the sand, where the intricate designs emblazoned on their shells are obscured. Four varieties of Emeritero have been documented and named after the tarot suits: Swords, Wands, Cups, and Coins. Their shells are crystalline, formed from the blue quartz abundant in Ultra Desert and trace amounts of pyrite and gold forming patterns on the surface.
Emeritero rely on trickery to survive. Their natural moveset is full of status moves and high critical ratios, and Trump Card is learned at much earlier levels than other Pokémon who learn this move. Notably, Emeritero learn different moves depending on their suit. Swords are physical attackers, Batons are special attackers, Cups are recovery-focused, and Coins rely on status moves. Sword and Baton-marked Emeritero possess the ability Super Luck, while Cup and Coin-marked Emeritero have Prankster. The four forms of Emeritero tend to feed together, allowing them to coordinate their various skills should a predator attack.
Every so often, Emeritero will dig themselves out of their burrows and swap places with the others around them. This behavior is also seen in battle, where Emeritero of different types switch places with one another in order to confuse the opponent. At times, different morphs will even mimic each other's behaviors to draw the attention of the opponent and lure them within range of an Emeritero specializing in attack. This remarkable coordination seems to be carried out via waving their forelegs and flicking their antennae. Captive specimens are highly cooperative and learn quickly from humans, making them quite easy to communicate with. The extent of their intelligence is currently being researched.