Battling in 1.2.5

I wanna battle some friends and we tried loging in the traditional route (DexNav online play etc), however only 2 options appear: Trading and wonder trading. There is no option for battling. So i wanted to ask how do you guys battle in 1.2.5.
I have read there is a battle sim but i dont know if it is functional or how to download it so if this is the solution to my problem please provide me with a link

In-game battling was removed in 1.2.5 because it was too buggy. The simulator can be accessed here, though it is only updated to 1.1.8 mechanics.

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Is there any way i can import my delta ambipom in there?

No, that is a 1.2 feature so it is not supported.