All decorations can be found in stores throughout the game, you just have to find the correct store.
Unfortunately there is no TV in Ruby/Sapphire/Emerald for a secret base. Many people worldwide will be upset. :(
on sapphire/emerald this one boy gives you the move secret power. use it to make a secret base!
No there isn't. The cave is in Pokémon Emerald
If you go through the dessert in Pokemon emerald, Sapphire, or ruby, you'll see a boy standing next to a tree. Talk to him and he'll give you the TM Secret Power.
The Red Tent is a decoration item in Pokemon Emerald for your Secret Base. There are many places around Hoenn that you can turn into a Secret Base. Note that most bases can only be caves or tree-houses.
I would say the one on the way to de-activate the generator at new mauville near the cycling rode in Ruby, Sapphire, and Emerald.
There are secret bases in Pokémon Ruby Sapphire and Emerald. In Diamond Pearl and Platinum, you have underground bases.
how to get all the tickets in Pokemon emerald?
tm43 in emerald is secret power
you need a Pokemon that knows secret power use that move to make your secret base
its on rought 128 in sappire/team oqua, ruby/team magma, and not shoure what criminals in emerald
SECRET