secret slab is not used (if you click the use option it is the same thing as trashing it). just keep it in your treasure bag and certain Pokemon (namely legendaries) will appear on some specific dungoen floors. You can only have this effect after getting marine resort from manaphy.
here are some of the floors:
miracle sea b3f: darkrai
shimmerhill 17f: deoxys
mysterious forest 10f: celebi
ampplains 7f: zapdos
deep spacial rift b5f (past the kanghaskhan rock): latios
happy out look b19f: latiaS
Keep it in your bag, and rare legendary Pokemon appear as recruitable enemies in certain dungeons, same thing as the mystery part
It is simply an item for legendaries to appear, like in Spacial Rift you can use it to get a Latias.
with a secret slab, you can find the following legendaries:
moltres
articuno
zapdos
deoxys
latias
latios
ho-oh
lugia
You look for a boss bounce pad thats sparkling.
You cannot obtain Thunderous in Pokemon Black, only in Pokemon White, since it is game-specific, like other legendaries. As for Landorus, you can find it in the Abundant Shrine.
in a place with water type Pokemon such as craggy coast
all the legendaries in fire red and leaf green are in ultra violet.
Whiscash Pond is not in Pokemon Mystery Dungeon: Explorers of Time/Darkness. It is in Explorers: Red/Blue Rescue Team though.
i know that you can find darkrai in the mystifying forest b13f and some other places and latias at the spacial rift 14f and celebi in the mystifying forest but i want to recruit them all! like what legendaries in what dungeon on what floor? pls help me!
the marina resort
After that, the game is done. you then have the options to start a new game, collect all the legendary treasures, or recruit all the legendaries.
the secret slab lets you find certain legendary Pokemon in cetain floors of a dungeon. for example, with a secret slab you can find darkrai on floor 3 of the miracle sea.
in Lala land
You Have To Beat All Of The Gyms, Elite Fours And the Champions. But Its Complicated To Find Legendaries.
You can find it in Surrounding Sea floor 18 with the Secret Slab or Mystery Part in your treasure.
to find the legendaries you need a secret slab or mystery part (or at least that's what I've heard)
No, you can't find all the legendaries in Diamond. There isn't a Pokemon game with all the legendaries in it. You can capture 8 legendaries in Diamond, f you want all the legendaries, you'll need to visit events, trade or migrate them.
You can't find level 100 legendaries in Pokemon Deluge. You can trade for them with other people. Add me on Deluge: LordOfLugia
Yes, you can find Celebi in mystifying forest if you have the secret slab and go to the 10th floor.
the cave