beat the second gym leader. hope this helped! : )
in the shipyard it was being built you get the ticket after the elite four defeat
go to the shipyard and talk to some dudes
the shipyard is in slaport town
you open them by teaching a pokemon secret power and then tap A next to the indent.
Forever
well they are secret bases but you need to teach one of ur Pokemon secret power(tm43), and u can get it in slateport city at the open market!(In Pokemon Sapphire).
Pokemon Ruby has Pokemon that Pokemon Sapphire does not and Pokemon Sapphire has Pokemon that Pokemon Ruby does not.
Pal Park (open after you beat the main game)
The elite four will open and they will be stronger and you can now trade with ruby, sapphire and emerald.
There is no Pokemon mansion in sapphire.
In the East side.
read sign, wait two minutes the door will open