Team Aqua's secret base is located in the lavaridge. Once at the lavaridge you must ride the cable car up to the acro bike. Take the bike and go down the hill. From there you will see a cave, this is the Team Aqua secret base.
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In your secret base.
Unfortunately there is no TV in Ruby/Sapphire/Emerald for a secret base. Many people worldwide will be upset. :(
u cant
u can buy it in slateport
You can't, unless you mean secret base. You have to have a Pokemon with Secret Power. Use Secret Power in front of a tree or an indention in rock.