Terapagos is a Normal-type Pokemon shown in the promotional material for Pokemon Scarlet and Violet's The Indigo Disk DLC. It is indeed a Legendary Pokemon that can be caught in the latest DLC, but as for how it can be encountered, that's where this guide comes into play. Here's what you need to know about getting Terapagos in Pokemon Scarlet and Violet.
How to Get Terapagos in Pokemon Scarlet & Violet's Indigo Disk DLC
Terapagos, the Hidden Treasure of Area Zero, can be caught in The Indigo Disk DLC --here's how to get the Legendary Pokemon.