Pokémon TCG: All Scarlet and Purple Ex cards revealed (so far)
The Scarlet and Violet set will bring the former mechanic back to the Pokémon trading card game. These are the few ex-forms that have been disclosed.

The Pokémon trading card game has brought back the former mechanics of the Scarlet and Violet suits, and many monsters have revealed their predecessors. The Pokémon Company has been incredibly secretive about the upcoming Scarlet and Violet sets for 2023, with only a few hints about what they might contain at the 2022 Pokémon World Championships. However, after some teasers and an accidental leak, more ex-forms have been revealed.
In the past, ex-mechanics worked in a variety of ways. When ex tags first appeared in the EX Ruby and Sapphire set in 2003, ex monsters were simply more powerful forms of regular Pokémon, and if they were knocked out, the trainer was given an additional bonus card. With the Pokémon Crimson and Violet TCG sets, the former mechanic will now be associated with Terastal Forms. Certain ex logos will appear plain on the cards, but those with ex spelled out in crystal font will be Terastal Forms, the benefit of which remains unclear.
Over 10 Ex Forms Have Been Revealed For Pokémon Scarlet & Violet

So far, 11 former Pokémon have been revealed. According to Poké Beach, these cards will be part of the first set of Scarlet and Violet TCG cards, named after the Gen 9 game. Monsters that get special EX forms range from legends and fan favorites to underrecognized characters.
Pokémon Scarlet & Violet Ex Form Reveals Include Koraidon, Miraidon, & More

The first major reveal of the former Pokémon happened at the 2022 Pokémon World Championships, where the Magnezone was introduced. Following the unveiling of Magnezone, the predecessors of Miraidon and Koraidon were revealed. Their cards initially hid key information about typing and energy, but it was later revealed that Pokémon Scarlet and Violet Legends would retain their main in-game typing: electricity and fighting.
The Pokémon Company released a trailer following the World Championship 2022 announcement. The trailer features Magnezone ex, Miraidon ex, and Koraidon ex as before, but also reveals two other ex forms. They are Lucario and Mimi.
According to PokéBeach, a video accidentally released by The Pokémon Company shows that these two former Pokémon - along with Ampharos x - will be part of the first set of Gen 9. Each of them will come with one of three Scarlet and Violet starters as part of the box set. Finally, the last former Pokémon was revealed in the first episode and confirmed to have Terastal effects: Arcanine.
Additional Ex Pokémon Will Feature In Future Scarlet & Violet Set

Poké Beach reports that there will be additional ex-Pokémon In Scarlet and Violet set. In the reveal, it was confirmed that in addition to the Magnezone ex, Gardevoir will have its own ex form. In addition to them, the Donphan-inspired Paradox Pokémon - Great Tusk and Iron Treads - will both get ex forms.
Finally, one of the four promo cards in the booster pack has been revealed: Cyclizar ex. Cyclizar showed a bright future for the Scarlet and Violet set, as the 11th former Pokémon was revealed. A plethora of interesting ex cards could mean more will be discovered as the Pokémon TCG begins to work its way into Gen 9. ^More: Pokémon Crimson and Violet is the perfect time to be in the TCG^Source: Poké Beach (2), (3), Official Pokémon YouTube Channel/YouTube