there are 2 types of symbols (silver & gold). to get the silver you must win 20 times in a row and to get gold 42 times. The pokemons of silver symbol are crobat, slaking & lapras and the pokemons of gold is arcanine, slaking & suicune
Well oyu must 1st make it to the palace then defeat everyone in it then you can get it DUUH! see ya!;)
Go to the battle frontier then go to the right the battle palace is the wide red building.
In Pokemon Emerald version you can get to a place called the battle frontier. There are several facilities here to test your strength as a Pokemon master. The battle palace is just below the battle arena. The battle arena is to the right.
easy you get 50 bp
Surf South of palace. Water Sudowoodo wiggle tree.
beat all battle frontier leaders
after you beat a certain amount of challenges you will battle a frontier brain which is sort of like the gym leader. if you beat them you get a symbol
At each of the places in Battle Frontier. Defeat the leaders of the places to get a battle symbol. Such as Battle Factory, Battle Dome and the others. Just beat the leaders of each facility and they'll give you a battle symbol.
Only in emerald version you can get sudowoodo you can find it next to the battle palace use the wailmer pail to water it it will attack you!
You get the symbol and 100 BP
When you beat the game you can go to the battle frontier and there is a spot to the right of the battle palace where an odd tree is use the wailmer pail on it and it attacks you its Sudowodoo! Catch it and your set.
Migrate a Pokemon holding it on Pokemon emerald. If you don't know how to get it on emerald you need to get every battle frontier symbol in silver.