Lugia is more of a defensive Pokemon, but why not turn defense into offense?
Item: Weakness Policy
EVs: 252 HP/4 Sp. Def/252 Sp. Atk
- Ancient Power
- Hydro Pump/Calm Mind
Aeroblast and Psychic are your reliable STABs, Aeroblast with a high chance for a crit, and Psychic with a chance for a Sp. Def drop. Ancient Power has a chance to boost all of Lugia’s stats. Hydro Pump is for coverage against rock types, but Calm Mind makes Lugia even more unstoppable in offense and defense.
The EV spread makes Lugia able to hit as hard as possible, while being able to tank a super effective hit. A Quiet Nature lets Lugia do insane damage after the opponent hits Lugia with a super effective move. Multiscale helps Lugia tank a super effective hit with minimal damage. Lastly, a Weakness Policy increases attacking power to the point of insanity after being hit by a super effective move.
Hope you liked this set!