You can only set it once at the beginning of the game to do so simply check the clock and move the D pad on the GBA to move the hands to the desired time then press A and press A again on YES.
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change the clock on your ds.
In your room there is a clock check the clock and you should know what time it is in Ruby.It even works in Emerald and Saphire.
Pokemon Ruby has Pokemon that Pokemon Sapphire does not and Pokemon Sapphire has Pokemon that Pokemon Ruby does not.
You can trade from Pokemon Ruby to another Pokemon Ruby using a link cable.
Did you set it on Wombo?