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at the end you fight raikou but you need secret slab/mystery part to recruit him and then there's six deluxe boxes at the end at the end you fight raikou but you need secret slab/mystery part to recruit him and then there's six deluxe boxes at the end ----- at floor 20 (30 floors) theres raikou need secret slab or mystery part (as said above). at floor 29 there is a key room containing a chest with the item for either regirock ice steel or regigigas (but sometimes theres a wonder gummi in it instead)
There is no cheat in Pokemon to get additional PC boxes. Those who need additional space in Pokemon X and Y can use Nintendo's Pokemon Bank service.
no way
I'm Sorry but you cant get more than 18 boxes in Pearl/Diamond
you can't catch more pokemon. you have to get rid of some pokemon.