Gen 8 reverted back to just three new Legendary Pokemon, although another in Kubfu (and Urshifu) was introduced in the Pokemon Sword and Shield Isle of Armor DLC. Despite Eternatus being one of the strongest Pokemon in the entire franchise, Zacian is seemingly more popular.
Most popular Legendary Pokemon from Gen8
Zacian
Gen 8 reverted back to just three new Legendary Pokemon, although another in Kubfu (and Urshifu) was introduced in the Pokemon Sword and Shield Isle of Armor DLC. Despite Eternatus being one of the strongest Pokemon in the entire franchise, Zacian is seemingly more popular.