I was in the same situation when I wanted to do the challenge, and in my experience, it's not strictly necessary, though it does help. The fight to watch out for is Sassy, but I didn’t have too much trouble. I got him down to half health with another champion and then just used Ant-Man. It wasn’t too hard, but you do need to stay on top of refreshing the debuffs.
I did it with a 7r1 unduped, and I honestly wished I had brought a 6r3 or 4 duped instead. It was difficult for me to keep the debuffs up without the dupe.
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But also, intercepting is not my forte.