Lugia @ Leftovers
Ability: Multiscale
EVs: 252 HP / 252 Def / 4 SpD
Bold / Calm Nature
- Toxic
- Roost / Recover
- Whirlwind / Dragon Tail
- [offensive move filler]
This is one of those toxic-stall builds, you want to use Toxic on the enemy and then attack/recover. I prefer to replace recover with Roost, as it makes Lugia lose a few weaknesses for a while. As for switching the enemy out, I use Whirlwind just because Dragon Tail barely does any damage and also has that 10% chance to miss. Finally, you can choose your own offensive move to use while the enemy is poisoned.