No
go to the main door and fight the final boss, tabuu
Yes, you neeb a secret slab or a mystery part to get legendaries in the final maze
the final maze is unlocked after you beat primal dialga and complete the other mazes. You can recruit Jirachi, Suicune and Moltres in the final maze.
If you mean in The Subspace Emissary, then the final level is The Great Maze, but there are four of those. Beat all the bosses, and then, you will have to go through the huge door in the middle room of The Great Maze, and you get Sonic and fight Tabuu.
he will show up in the final maze but you need a mystery part and a secret slab
Final maze is 48 floors.
You beat all the dark people once again go in the big door and fight tabuu again
You don't need any specific object to get the ones in the Final Maze. If you want the secret slab anyways, here's a wondermail code: S=W7 3&8S 2CSQ 0-7Y HP3+ H260 questioner:no need i entered it already
You can't, but you can use it in the Final Maze and in other areas you may find legendary pokemon. I've heard rumors thats articuno, moltres, and zapdos live in the Final Maze and you can only get to them with the secret slab in your inventory. Other pokemon I don't know so you can google something like: "What Pokemon can you get with the Secret Slab"
It depends which secret treasure chest and which maze.
to find the legendaries you need a secret slab or mystery part (or at least that's what I've heard)
It is in Final Maze 40F you need secret stone plate or enigma part in bag (secret slab or mystery part)