The same time as in real life, if you played friday, it's friday, and if you play again in monday, it will be monday :)
To the leaftnof Mauville
it's always daytime on ruby sapphire and emerald
it depends on the seed, but i think most take about a day.
Pokemon day care or put exp.share on a weak Pokemon
There isn't sorry you have to do it the long way round
Pokemon Ruby has Pokemon that Pokemon Sapphire does not and Pokemon Sapphire has Pokemon that Pokemon Ruby does not.
Usually 3 days make sure you water it alot on each day.
To get Sableye in Pokemon Pearl you will need a copy of Pokemon Sapphire. Insert Pokemon Sapphire into the GBA slot of the DS and turn it on. When you load into Pokemon Pearl wild Sableye should start appearing at Iron Island as long as Pokemon Sapphire is in the GBA slot.
once a day
There is no Pokemon mansion in sapphire.
either Pokemon event which passed a long time ago or by trading
He is not in Pokemon: Sapphire. You will not be able to find him. He is in Pokemon: Diamond, Pokemon: Pearl, and Pokemon: Platinum. You will definitely have trouble finding him in Pokemon: Sapphire.