How to push? or trophy level works?

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I have seen the option "trophy level" how this feature works? i mean... i usually work with barch, but my trophy range always goes to less than 900 trophy.

It is very bad to farm manually dark elixir than gold 3, 2, etc...

If i have active this option how it works? how the software reach this average trophy? it can be reached with barch or just work with some troops?