>>22043198>Mega Ray can't harm FriezaMega Rayquaza flew through six miles of rock like it was nothing, which also meant shrugging off a head-on collision comparable to the one that killed 75% of all plant and animal life on Earth roughly 65 million years ago.
Frieza was bisected with a sword as Mecha Frieza, which is supposed to be an upgrade from 4th form Frieza. Said sword is later shown to be breakable when used against a character whose power level is a fraction of Frieza's. He was also seriously injured by a Spirit Bomb which clearly was not powerful enough to threaten the stability of planet Namek.
Frieza does not seem to be able to take hits as well as he can dish them out. And while I can't say with certainty whether or not he'd flat-out lose to Mega Rayquaza in a fight, I doubt Frieza is taking a Dragon Ascent unharmed.
>Saiyan Saga Vegeta and Kaioken x4 Goku>actually being a threat to Mega Rayquaza