3rd Gen Battle Frontier Order?

I'm having trouble beating Battle Frontier because I have no clue what order to beat it in. And also do you need to beat them on Single Battle or level 50 or anything like that?

There is no order. However, you can only earn the symbols in Single mode.

There isnt a order. The rules are:
Beat them in single mode
Depending on what battle building it is, tou have to beat it a ceratin number of times in a row, like the BAttle dome:5 times
The Battle pike: Two times
Battle Factory: 20 times (i think
And more


And that for the silver symbol, for gold, you gotta beat it a LOt of times.

Oh, the guides at the beginning said you have to beat it in a certain order. Also I'd played Battle Factory way over 20 times but in double battles. Thanks for answering my long unanswered question.