You should be able to trade with any compatible Pokemon game, unless you have not arrived in Petalburg City for the first time yet. If you try to trade in Oldale Town right after Professor Birch gives you your Starter Pokemon, the receptionist will tell you the trade center is still undergoing adjustments. So go to Petalburg City and then the receptionist should allow you to trade.
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You can trade from Pokemon Ruby to another Pokemon Ruby using a link cable.
trade from Ruby/Sapphir trade from Ruby/Sapphir trade from Ruby/Sapphir trade from Ruby/Sapphir
There are none in Pokemon Ruby trade from FireRed or LeafGreen.
There aren't any Growlithe in Pokemon Ruby, but you can trade for them from Pokemon Fire Red or Pokemon XD.
YES, YOU DUMMY!(after you defeat the Pokemon League and get the Ruby/Sapphire.)