If you mean the mission after the story mode where you have to fight the "King of all Darkness" or something like that, it just turns out to be the whole guild, who are just testing you. You do have to fight all of them at once, but they are all easy, save Wigglytuff, who is the strongest of all of them.
It depends who you are and what moves you know
For Pokemon Blue mystery dungeon there is not a code to recruit all Pokemon monster in the game. There are several codes to help progress through the game such as spawning the Friend Bow.
You can occasionally see them at Giant Volcano, most often as part of a Monster House.
Get Petrify Orbs and Spurn Orbs!!!
a monster house is were you walk into a room and lots of Pokemon fall down and attack you.You have to have been in a monster house before they are every were.
go to the dungeon which monster house come many times then when u will kill Pokemon u can get it sometimes
23-32 level 32 and over will have 75% monster house
You have Pokemon know the move discharge then take out the monster house Pokemon cause they are very weak! Then just go ALL OUT on Darkrai.
monster houses occur by 1 or more GUMMIS.it always happens to me when ever i see some gummis.if this help you LIKE me :3
The more harder the dungeon the better like in amp plains
That's Easy You Just Need A Good Move Like Blizzard Or Roar Of Time Which Hits Every One In the Room
There are 99 floors in Silver Trench & consists of predominantly water-type pokemon. Lugia resides on the 99th, and has a recruitment rating of 99.9% when you go up a second time. Floors 15 35 55 75 are just HUGE monster houses