Luigi's awesome attack speed and power allows him to defeat every boss quickly. His high jumps also allow plenty of opportunities to evade while counterattacking. As such, the bosses were mostly easy. The Duon though was a bit troublesome, as with Luigi's atrocious air speed and his floaty falling speed, he has a really tough time getting to the other side of the Duon safely during the homing missiles, and then if the Duon survives the missiles, Luigi will have an even tougher time making it back to the other side. Overall though, the three usual freebies were still freebies, and the rest of the bosses fell easily.
And before anyone tries to accuse something, I didn't get hit by Tabuu's eye lasers in the end because there are no hitboxes in that laser area (the eye lasers have really weird hitboxes in general).
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Omega Tyrant currently has 2,034,982 views spread across 155 videos for Super Smash Bros. Brawl. His channel uploaded 15 hours worth of Super Smash Bros. Brawl videos, roughly 28.79% of the content that Omega Tyrant has uploaded to YouTube.