OK I just battled a beta tester or hacker, who has got all the exclusive Arks including the Kimiwyrm.
I felt like it was a hacker patrol because he/she used his or her typhoon-like Ark to keep knockbacking my Arks. That person also tried to disconnect at the end of the battle.
Very sadly that person did not disconnect on time, and I was defeated, breaking my winning streak. If that person is you, I would like to talk to you here.