Lugia is a Psychic/Flying-type Legendary Pokémon and the version mascot of Pokémon Silver and Pokémon SoulSilver. It is heavily associated with the sea and often slumbers in the depths. While not being a Water-type it can learn several Water-type moves. In the National Pokédex, it is registered as #249 and known as the "Diving Pokémon". Prior to its debut in Generation II, it first appeared in the second Pokémon movie, Pokémon the Movie 2000: The Power of One.
Aeroblast is a special Flying-type move with 100 base power, 95% accuracy and an increased chance of dealing a critical hit. It is Lugia's signature move, and thus the only Pokémon able to learn it naturally. Stat-wise, Lugia has great Special Defense, Defense and Speed, but its offensive stats are average, especially for a Legendary Pokémon.
As a Poké Ball Pokémon
Lugia uses Aeroblast as its attack. When summoned, Lugia will remain on the screen for a few seconds, and then fly off the screen to the background of the stage (similar to the movement of Ho-Oh). Lugia will release an Aeroblast that will travel around the stage in a random pattern (circular/left to right or right to left/sweeping the ground and vice versa), that will move towards the direction of the summoner's opponents.
Before Lugia flies off into the background to perform Aeroblast, any character that makes contact with Lugia will take 30% damage and sustain extremely high vertical knockback, similar to touching Moltres's wings; it can KO most characters as low as 35%. Though Lugia's body hitbox is not as powerful as Moltres', it covers a larger area due to Lugia's much larger size. Aeroblast has multiple hits, allowing this attack to be escapable with very quick and precise SDI, though extremely difficult to do so and survive. Aeroblast can inflict up to 440% in a little over 2 seconds, with each hitbox dealing 20% in damage. The knockback inflicted by Aeroblast is extreme, which combined with the massive damage it deals, allows it to invariably OHKO a player trapped in it unless they can tech a wall or ceiling. However, the first hit of Aeroblast can whiff if the opponents are hit at the left or right endpoint of its range. Even a player gets hit once instead of multiples hits, a single hit has enough knockback to KO at low percentages (roughly 35%), but not to OHKO. However, due to its diagonal angle, DI'ing down and away cause this attack KO'ing at early-mid percent (50% onwards). Neither attack of Lugia's can harm the summoner.
Lugia is arguably the best Pokémon in Melee, as its huge body hitbox KOs well under 100%, and its Aeroblast OHKOs, while covering a very large area (for example, a Lugia summoned in the center of Battlefield would be able to strike anywhere onstage with Aeroblast). It is also possible for Lugia to KO the same opponent twice (from touching it before it flies off, and then getting hit by Aeroblast), which is the only Pokémon in Melee with this capability.
Due to Lugia being a Legendary Pokémon, the chance of summoning Lugia is rare, with only Mew and Celebi being rarer Pokémon. However, the chance of Lugia appearing out of a Poké Ball is greatly increased in the event match Legendary Pokémon.
Lugia features as a collectible trophy, unlocked as one of the 100+ trophies that can be collected randomly during normal play, such as in the Trophy Lottery and throughout the various Single-player Regular Matches, though it only appears once 200 VS matches have been played. It reads as follows:
As a Poké Ball Pokémon
Lugia reprises its role from Super Smash Bros. Melee. When it emerges out of its Poké Ball, it will fly into the background and use Aeroblast, as it did in Super Smash Bros. Melee, but with a more detailed blast. In some fields Lugia was significantly changed in Brawl; the first such change is that touching it pulls the player away with massive vertical knockback, avoiding multiple hits in most cases. However, opponents are still inflicted 30% damage and can easily be star KOed as low as 30%, slightly better than Melee. It is possible to chain each hit for a star KO, but it usually works at middle to high damages. In some situations a perfect chaining can deal to an OHKO, but it happens rarely (as in Melee).
Its Aeroblast still invariably OHKOs, but only in one hit; the primary change, in fact, is that hit opponents will usually sustain a single hit before getting knocked out, instead of taking every powerful hit in the attack before being launched, preventing the ridiculous damage output it dealt in Melee. This means that avoid this attack (on sides, where it still whiffs) is more simple now, although there is still a possibility to get caught and suffer more hits: in this case, combined damage can still reach 440%. Each hit still inflicts 20% damage. Aeroblast additionally covers a much smaller area, making it more difficult for opponents to get hit by it; this change severely reduces its potential on larger stages.
However, Aeroblast is still extremely powerful, a guaranteed OHKO, also Lugia’s body can KO at damages as low as 30%, and despite some nerfs, it is still one of the most useful Pokémon in Super Smash Bros. Brawl. Also, it still retains from the previous game the possibility to KO a character two times in a row (first KO by touching Lugia’s body and second OHKO from Aeroblast). Anyway it is not unique anymore, since other Pokémons share this ability in Brawl.
This trophy can be found randomly during normal play, including the Coin Launcher.
As a Poké Ball Pokémon
Lugia returns to the Smash series for a third time, once more using its Aeroblast upon being released from a Poké Ball. It is severely nerfed from the two previous game and no longer OHKOs, although dealing very high damage if all hits connect (up to 240%). Contact with Lugia’s body is also less powerful, KOing light characters over 50% and avoiding multiple hits most times; it still deals 30% damage. Now Aeroblast starts to KO around 60%; if most or all hits connect it can still KO as low as 35%, but this outcome is very rare. Like other legendary Pokémon it can also appear out of a Master Ball.
As a Poké Ball Pokémon
Lugia returns as a Poké Ball summon, with no differences from Smash 4 and still heavily nerfed.
Lugia cannot be summoned on 3D Land, Arena Ferox, Brinstar, Corneria, Dream Land GB, Frigate Orpheon, Gerudo Valley, Hyrule Castle, Living Room, Luigi's Mansion, Magicant, Mario Circuit, Mario Galaxy, Mushroom Kingdom U, Mushroomy Kingdom, Pac-Land, Paper Mario, Prism Tower, Reset Bomb Forest, Skyloft, Skyworld, Super Mario Maker, Suzaku Castle, Temple, The Great Cave Offensive, Tortimer Island, Umbra Clock Tower, Unova Pokemon League, WarioWare Inc., or Wrecking Crew.