I don't know what to categorize this as, but he's definitely not replying and posting the same mob again when I already told him he traded me a wrong mob. I thought it could have been re-rolled but on second thoughts re-rolled mobs have not '+' if I'm not wrong.
Watch Chanco21's water team vs. PHKES5's water team.
Chanco21 has a 1251 PvP rating and his team features 2 invincible, 1 counter, 1 shield, and 1 swap for actives.
This video explains how to properly use the Swap ability on Battle Camp. It also describes a method you can use to become better at it. All mechanics and calculations behind Battle Camp gem-matching are explained.
Scamming.