Favorite duo released?

Wondering what your guy’s favorite champ duo released as a whole. Some that come to mind for me would probably be: RG and BWDO, HM and tigra, Warlock and SS, Apoc and Prof X, and Storm X w Kali. Lmk below!
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Honorable mention might be Apoc and Prof X.
Apoc and Prof X
Shang Chi and Negative
But I really loved iBom and iHulk
Edit: oops , realized They were released one month apart with surfer being the only hero in December 2019.