Dragon Skull is an item in the “Plot advancement” category (Key Items).
In-game descriptions
| Black / White · Black 2 / White 2 · X / Y | A skull of a Pokémon which was said to have braved the angry waters to fly around the world. |
|---|---|
| Sun / Moon · Ultra Sun / Ultra Moon · Let’s Go, Pikachu! / Let’s Go, Eevee! · Sword / Shield | A skull of a Pokémon that was said to have braved the angry waters to fly around the world. |
Where to find it
Not placed on the atlas maps (so far: Red/Blue and Generation 3).
Sources : PokeAPI (items, item_flavor_text, machines) · atlas · pokeemerald species_info.h