Can Mew ex's "Genome Hacking" attack use Medicham V's "Yoga Loop" attack to repeatedly get extra turns?
Yes, Genome Hacking on Yoga Loop could work infinitely, if you're able to pull it off!
Source: TPCi Rules Team (2023-09-28)

Relevant cards

Note: All applicable cards may not be listed below.
SV35_151
SV35_151
SWSH7_83
SWSH7_83