That character represents the friend who you mixed records with in the Union Room. There are different Trainers in the game, and every player is assigned a random Trainer such as a Bug Catcher to represent him/her in the Union Room. The only way to discover your character is from Battle Tower or secret bases.
If you mix records with your friends and they have Lv100's you can raise your pokemon's level by visiting your friends in their bases and battle.
it is a item you can put in your secret base
To find your Secret Base, talk to the short guy in a house in western Mosdeep City. He will mention a base on a certain route. Go there, and find your Secret Base on that same route!
Unfortunately there is no TV in Ruby/Sapphire/Emerald for a secret base. Many people worldwide will be upset. :(
Those are places you can make your secret base in how to do that you say use secret power on the indents to make a hole appear now you can create your own secret base.
In one of the southern tree houses of Fortree City.
You go to their secret base just tright of lilycove
no, you use secret power on it then it makes a base.
you go to lilycove deparmemt store top floor
Your friend's secret base and whoever's secret base that you friend managed to get and some stories about your friends on the TV. Chances of some outbreaks of pokemon, Lilycove Department Store Clear-Out Sale (if defeated elite four) and/or Pokeblock Master (if defeated elite four) on the TV increased.
You have to obtain 1000 secret base flags (ridiculous) and talk to the main secret base guy in fortree city and he will give it too you good luck!
A Friend's BaseBattle your friend or just admire their decorating skills.