“After soaring upward, the user attacks its target by dropping out of the sky at high speeds, although it lowers its own Defense and Sp. Def in the process.”
Dragon Ascent inflicts damage and then lowers the user's Defense stat and Special Defense stat by one stage each.
Other effects[]
The player can Mega Evolve any Rayquaza that knows Dragon Ascent. Rayquaza cannot Mega Evolve if it is holding a Z-Crystal or knows the move only through Mimic. Starting in the Eighth Pokémon generation, Rayquaza no longer Mega Evolves.
Dragon Ascent doesn't exist in the game data of Pokémon X and Y, which means that a Pokémon that knows the move can't be traded to Pokémon X and Y from Pokémon Omega Ruby and Alpha Sapphire. Likewise, a Pokémon in Pokémon Bank that knows Dragon Ascent cannot be withdrawn in Pokémon X and Y. The Pokémon must forget Dragon Ascent in order to be transferred to Pokémon X and Y.