Dream Grove (Nightmare)

If you are looking for the Daydream version, go here. The Nightmare version of Dream Grove can only be accessed during the Dusk/Night. The Dungeon has mostly Dark- type Pokémon, but also has a number Ghost- and Psychic-types as well.

Attributes
The dungeon will have Foggy, Rainy, or Cloudy weather.

Floors 1-18
...

Floors 19-30
...

Dream Passage
After Floor 30 is a break point. You spawn in an enclosed room with a warp and door. To open the door in front, you need the Mischievous Key dropped by the midboss in the Daydream version of Dream Grove. If you don't have the key, the warp takes you out to the Central Fork of Tanren Undercity. Beyond the door is another room with a locked door. On the left of this room is a warp leading to the Royal Garden. Once you get a Garden Key from there, you can pass the next door and access the storage and move on when ready.

Royal Garden
The player must go through this puzzle to grab the Garden Key to open the locked door in the Dreamy Passage to progress further into the dungeon. If the player uses Honey in this room, one Skrelp/Inkay will spawn, but this entirely depends on the player's ID.

Floors 31-40
...

Clefable, Espeon, and Dedenne
Upon leaving F30, you will come across a team consisting of Clefable, Espeon, and Dedenne, who are having a tea party. Clefable invites you over and tries to convince Espeon that you are Alice (as you are referred to as Alice the entire dungeon run. Choosing No when Clefable asks you if you are Alice will cause Clefable to say that you are clearly Alice). Espeon, however, has doubts. Then, Clefable's team challenges you to a fight. After winning, Espeon is finally convinced that the player is Alice, and Clefable mentions that the key she dropped was a Whimsical Key, which she has since she was a Cleffa. Then, Clefable and her friends return to the Tea Party, since they enjoy tea regardless if it is cold or not.

* Clefable, Espeon, Dedenne (Dusk/Night)

Boss Drop:
 * Whimsical Key (Clefable)

Before Fighting: After Defeating:
 * ???: Well, don't just stand there, looking around! Come on over and have a seat, Alice!
 * Dedenne: W-wowie... I thought you'd never come, Alice...!
 * Espeon: Mrrreow... Nor did I. Can we be sure that this is truly Alice though?
 * Clefable: Why of course it is!~ Don't be such a downer, Espy!
 * Clefable You are Alice, aren't cha, Alice?
 * (Yes)
 * (No)
 * Clefable: What's that? You said your name is [player name]...?
 * Clefable: Nonsense, silly! You're Alice, Alice!
 * Espeon: Hrm... Convincing. I believe it.
 * Espeon: Well, let's get on with our tea party, shall we?
 * Clefable: We shall!
 * Dedenne: S-say... Alice... Would you like to have some tea with us?
 * Espeon: Don't be silly, Dedenne. Alice wouldn't want to have tea with a bunch of fugitives such as ourselves.
 * Dedenne: You're right, E-espy... How silly of me to think someone as famous as Alice would want anything to do with us...
 * Clefable: Say.... You guys, we aren't really criminals, y'know...
 * Dedenne: Y-you're right, Clef... I just... wish we belonged here...
 * Dedenne: A-ah...! But... let's not bore Alice with the specifics!
 * Clefable: You're right. Let's not bore our poor darling Alice, eh?~
 * Clefable: Perfect little Alice... They aren't outcaster for being different, so... Why are we?
 * Espeon: ...
 * Dedenne: ...
 * Clefable: Say, Alice... Let's play a game!~
 * Clefable: Don't worry, we've just gotta test you!~ Won't hurt a bit if you're strong enough, dear, sweet Alice~
 * Espeon: Yeowch... Yep, that's definetely Alice.
 * Clefable: Tooold ya~!
 * Clefable: Sorry about that! Espy still had some doubts about whether you were Alice or not, so we had to make up a reason to fight ya!
 * Clefable: Well... Half made-up. We really are outcasted here... The King and Queen of this land banished us for not being like their people.
 * Dedenne: I-I know we b-belong somewhere... I just wish we knew where...
 * Espeon: That's where you come in, Alice. The legends say that you have an ability that allows you to traverse two realms...
 * Espeon: We believe the realm opposite to ths one... is where we belong.
 * Clefable: You saw the key I dropped when you beat us up, didn't cha? That's a special key!
 * Clefable: I... honestly dunno where it's from. I've had it since I was a little Cleffa.
 * Clefable: Which is why I am under the belief that it may be from our home realm! That's where you come in, oh wondrous Alice!
 * Clefable: If you want it, you could have it... But! You've gotta promise somethin' to us!
 * Espeon: You must defeat them, Alice. The Queen and King... Not just for us, but for their subjects as well.
 * Espeon: They've gone absolutely mad with power. Before they reigned, we were accepted by our peers despite our differences.
 * Dedenne: But... not just us.. The other Pokemon here say t-that they've even been enforcing obscure laws... imprisoning even their most loyal of subjects...
 * Clefable: We'll be off now~! We've got some cold tea to drink! It's cold and rather different, but we like it all the same~

Malamar and Dragalge
The two main bosses are Malamar and Dragalge. Malamar tells the player (who is still referred to as Alice) that they are late, and tries to think up of a punishment. Dragalge mentions that "the little urchins" are missing. Malamar tells Dragalge that they are in the garden. She then tells the player that the pink things are disturbing the Nightmare kingdom, and the player is no exception. She then challenges the player to a battle, saying that she and Dragalge will purify the player. After the player wins, Malamar is shocked about her loss, and then, she realizes that the pink things are not bad after all. She then tells the player that she will let the pink things, and in extension, everyone in, regardless if they are good or bad. She then tells Dragalge that they have a party to attend to. The two then leave.

Boss Drop:
 * Nightmare Key (Malamar)

Before Fighting: After Defeating:
 * Malamar: Ah, Alice. You've arrived~
 * Malamar: You're late, late, late. I should have you punished for taking so long!
 * Malamar: I shan't though... There are other punishments you must face.
 * Dragalge: Hey, honey, before we punish Alice... Have you seen our kids?
 * Malamar: Shhh, dear. I'm in the middle of deciding Alice's punishment.
 * Dragalge: But dear... Shouldn't our little urchins come first?
 * Malamar: ...They're probably just in the garden, now shhh!
 * Malamar: Anyhow Alice. You've been interacting with those miscreants, haven't you? The... pink ones.
 * Malamar: I shudder at the thought of them! How dare they befoul my beautiful dark kingdom.
 * Malamar: You, are filthy as well though, Alice. Only through a divine punishment can you be purified... Iti s only fit that I be the one to grant it to you.
 * Malamar: Now, Dragalge, let us purify this soiled soul.
 * Malamar: H-How...? How could someone so impure and peculiar beat me?
 * Malamar: You are the most impure... the most contrasting and varied team of Pokemon I've ever seen.
 * Malamar: How did you manage to beat me and my king? We are in sync. We are similar. We are harmoniou---
 * Malamar: No, I see now. Being similar in physical characteristics does not equate to a harmonious pairing.
 * Malamar: ...I think I understand now. With too much uniformity comes a weakness of its own.
 * Malamar: Without a bit of diversity, everyone's weak and has no one to negate their flaws.
 * Malamar: You, Alice... With your diverse and far from ordinary team of Pokemon. You are the one who acheived harmony, and with that, the strength to beat my discordant kingdom.
 * Malamar: I will welcome the pink ones back into my kingdom.
 * Malamar: Not just them, though. I will welcome anyone who wishes to join us, no matter how different they may appear.
 * Malamar: ...Thank you, Alice. You have taught me that no one should be afraid of a bit of diversity.
 * Malamar: Come, Dragalge. We have a tea party we simply must attend.

End Box
There are a total of six End boxes in the room. Without either of the keys the boss drops, you can only get two of the End Boxes. This will cover what you can from the Sinister Boxes (using the key obtained from the Nightmare boss). If you want to see the other four boxes' items, check the main Dream Grove page or the Daydream page.
 * Revival Herb
 * Max Revive
 * Moon Stone
 * Energy Relic
 * TM Taunt
 * TM Dark Pulse
 * TM Sleep Talk

Secret Room
This dungeon has two secret rooms the player can find. The first SR is a traditional one, where there are two boxes.
 * Relic Gold
 * Relic Copper
 * Max Revive
 * Dark Dust
 * TM Payback
 * TM Shadow Ball

The second Secret room does not have any boxes, but the player can use honey to spawn Darkrai. This room can only be found from Floors 31 to 39. The following items can drop from Darkrai:
 * Dark Diamond
 * Darkrai's Heart Slate

Pokémon
''Pokémon in bold are recruitable. Please visit the Recruitable Pokémon page for more information.''

Dungeon Objective
If you want to progress in the Daydream version, you have to beat the midboss here to get the Whimsical Key. Another objective is to search for the second Secret Room for Darkrai to obtain its Heart Slate. Additionally, depending on the player's ID, they can use honey in the Royal Garden to spawn Skrelp or Inkay. Their evolution items are also obtained here. Nightmare Dream Grove also frequently spawns Reviver Herbs and Seeds, as well as Vanish Seeds and Invisify Orbs which are items that aren't in the common dungeon.

Tips

 * Bring some Honey with you for recruiting Skrelp/Inkay or to find the SR between floors 31-39.
 * If you forget to, you can run the Royal Garden again for two keys to unlock the door for the storage and unlock it again to go back.

Trivia

 * The Nightmare version of Dream Grove is the only one to have a recruitable Pokemon outside of Royal Garden, being Duskull.