Dusk Stone Ore
From Pixelmon Wiki
Dusk Stone Ore can be found in Swamp (Forge) biomes, near the surface; and under Swamp Raid Dens and Taiga Raid Dens. When mined at dusktime, a Dusk Stone Ore yields one Dusk Stone Shard. However, if it is mined at another time, it will yield Cobblestone instead. Nine of which make a Dusk Stone. A pickaxe is needed to mine this ore.