Serpente-Eau and Vert-de-Fer, the new Suicune and Viridium from Pokémon Scarlet and Violet
To celebrate the 27th anniversary of the Pokémon license, The Pokémon Company has released a presentation of upcoming Pokémon content for the coming year. Players of Pokémon Scarlet and Violet have something to look forward to with the upcoming arrival of a two-part DLC, the Buried Treasure of the Zero Zone. But until it is available, two new Paradox Pokémon are available: Serpente-Eau and Vert-de-Fer.
Serpente-Eau is a prehistoric version of Suicune of the Water/Dragon type. He is only available in the Scarlet version. Iron-Green is a futuristic Plant/Psy-type version of Viridium, available to players of the Violet versions. These Pokémon were teased in the Pepper book.

These Pokémon can only be caught through Teracrystal Raids which will be available on February 27. If you have the Scarlet version, you will need to join a raid created by a Violet Pokémon trainer to battle and capture Irongreen, and vice versa.
Water-Snake will be a Water teratype boss, while Iron-Green is a Psy teratype boss. Choose your Pokémon accordingly before launching a raid.
Happy hunting!