Altaria learns Double-Edge either by the Move Tutor in the Sootopolis City Pokémon Center (the lady near the bookshelf), or by breeding with a Bagon, which learns the move itself at Lvl. 53.
Altaria learns dragonbreath at level 35.
sing
No it cannot
59
altaria
Sadly no.
Altaria learns Perish Song at Level 62.
Altaria learns Dragon Pulse at level 54 in Pokémon Sword and Shield.
It learns double egde at level 63. Double edge is that last move Aggron learns.
Altaria cannot learn earthquake through leveling up or breeding. However, it can learn earthquake through Move Tutor in various Pokémon games or by using a TM for earthquake in certain generations.
crunch double edge and dragon claw
he can learn dragonbreath