In http://pokemondb.net/pokedex/lugia , it says Lugia learnes Aeroblast at Lv. 85. But when I click on the move Aeroblast page ( http://pokemondb.net/move/aeroblast ) , the webpage says Lugia learnes Aeroblast at Lv.43! So I'm knid of wondering which one. ( Same thing with Ho-oh 's Sacred Fire.
Lugia learns Aeroblast at level 85 in DPPt (Diamond, Pearl, Platinum). In HGSS (HeartGold SoulSilver) it learns it at level 43, so when you face it in the wild then it will already have its signature move. It also learns it at level 43 in Gen V B/W.