Secret Slab Legendaries...

They're impossible to recruit unless you have a friendship item, like the type ones, like Grass Cornet, etc. Does anyone else think that this is too much trouble to go and kill Heatran to get the item for Ho-oh, or Mew to get Celebi. I find this inconvenient, and I haven't even mentioned anything about getting the Secret Slab/Mystery Part yet...

I think that the first time you get to the legendary pkmn, you beat it, and get the item and go back again to befriend it.

Yes, I knew that, but I'm saying that the legendaries only available through a Secret Slab are impossible to recruit without the aid of one of the Seven Treasures. This has nothing to do with the guardians of said treasures.

Secret Slab Legendaries and corresponding Treasure:
Celebi (Grass Cornet)
Ho-oh (Fiery Drum, Sky Melodica)
Zapdos (Sky Melodica)
Moltres (same deal as Ho-oh)
Entei (Fiery Drum)
Lugia (Sky Melodica)

Those are the ones that can be got with a Treasure. The others, however, that can be found here, do not have a corresponding item, and therefore are a lot harder to obtain.

How do i recruit Rayquaza? I have beaten the game twice but i still dont know how to recruit it. Help please? =)

Oh, you have to go up Sky Stairway again and rebeat it.

thanks elthan i was unsure myself