You don't get it, you only pass it once in the story line.
Dark Crater in Pokemon Mystery Dungeon: Explorers of Time has 25 floors. This dungeon is known for its challenging layout and strong Pokemon encounters.
dark crater
15
* Giant Volcano * Dark Crater * Deep Dark Crater
To unlock Dark Crater in Pokemon Mystery Dungeon Explorers of Darkness, you need to complete the main storyline of the game. Once you have finished the main story, you will receive a special mission to explore Dark Crater and take on its challenging dungeon.
get to the dark crater ther its chimchar.
U find Darkrai in Dark Crater.
You must get past Dialga and Palkia and have cresselia unlocked to enter dark crater
You must have a Secret Slab/Mystery Part. He is in Dark Crater, 10F.
Darkrai can be found in several dungeons afer you defeat him at Dark Volcano.
Dark Crater be ready he has like 6 other Pokemon helping him and cresselia is low lv
you can't unless you use ar