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.
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It is just a different color of the red tent, which is a secret base item that hides you.
You can get it from a person in the lobby of the Verdanturf Battle tent.
In Pokemon Emerald Version, TM41:Torment can be obtained from a sailor in the Contest Hall or Battle Tent in Slateport City.
The green tent, as far as I know, does not exist. But there is a Blue Tent and Red Tent, received from the Trick Master after completing his final maze. Sorry!
you need to have beaten the elite 4. go to the trick house and solve it. the trick master should give you a red tent as a reward.