Both
- M-Gyarados with Wa+AT*/HP or DT*+Ou and
- S-Gyarados with Wa+AT*/HP
were found to be useful in raids, and those with Water-type movesets were found to be the best counters in very rare cases. There is still no known use for Dark-type movesets in raids.
RT @yuukikonnobot@twitter.com
Mega Gyarados movesets
- Water: Unknown use.
- Dark: Fastest against Psychic TGR.
- Dragon: Fastest against Dragon TGR (tied with Galarian Darmanitan).
: https://twitter.com/yuukikonnobot/status/1494557582312501248