Ancient Minister
He is the servant of the main villain of the game but he turns to the good side as R.O.B.
You do not actually fight this character, but he is the main villain in the beginning.
Petey Piranha
Petey shows up within The Subspace Emissary. He carries two cages, one in each hand that contain Princess Zelda (on the left) and Princess Peach (on the right). You only get to save one, so pick the cage that holds the girl you want to play as later and then smash it to pieces.
Petey is invincible in the fight, so focus on the cage and not him (he can be hit, but he doesn't have a health bar like the cages do). As with all enemies and boss fights, smash attacks deal a significant amount of damage in comparison to normal chains and special attacks.
The giant humanoid plant has only two real attacks: swinging one cages in a sweeping motion, or launching himself similar to Bowser's ground pound attack. When he swings one of the cages, just jump over them or move to one side. When he launches himself, run as fast as you can away from the direction he's moving (move in the opposite direction that he is). If you and him are on an edge, just run to the center of the stage. His falling motion will deal a hard punch, and will probably KO you if you're over 100%.
If you save Peach you will fight Mario and Pit latter on but if you save Zelda expect to fight Link and Yoshi latter on.
It does not matter which Princess you save because both of them will be captured latter on.
Rayquaza
Rayquaza appears in The Subspace Emissary's jungle section, when Diddy Kong finds Fox's ship crashed near a lake.
Its moves include the following things listed here:
- It digs into the ground and attacks its foes.
- It attacks with high speeds.
- It has a variety of range attacks.
Ridley
The leader of the space pirates in the Metroid series, Ridley is a large, flying dragon-like creature that can breath fire, yet he doesn't breath fire till you fight Meta-Ridley. He can blow you back by flapping his wings, scrape the ground by his tail, and use few of Master/Crazy Hand's and Raycuaza's moves.
Porky
A kid from Mother 3 in a mechanical monster terror spider that had a variety of attacks like; attacking with its 8 legs multiple times in a row, creating a huge energy ball shooting powerful energy beams, summoning exploding robots, and floating in the air while use the energy beam.
Galleom
A boss that transforms a lot from its vehicle-like mode to ram into foes, shoot missiles, and a super-powerful stomping robot.
You fight it two times. Once as Ike, Meta Knight and Marth, and the second time as Lucas and Pokémon Trainer.
Meta-Ridley
Same as before only made of metal, shoots fireballs, and will attack the Falcon Flyer with several attacks.
You have a time limit, and if you don't kill it quickly, you lose. It flies off the screen a lot, so you need to be on your toes.
Duon
The second of the two Subspace Army mechs. After the Mr. Game & Watches are tossed out of the control room of the Battleship Halberd, they are converted into Shadow Bugs. These Shadow Bugs combine to form Duon, fought as Fox, Peach, Zelda, Lucario, Snake, and Falco. When it is defeated, it reforms back into a single Mr. Game & Watch, which joins the effort to defeat the Subspace Army. Expect this boss to be a hard one.
The two bodies, pink and blue, have different attacks. Blue has mostly direct attacks, so it is best to attack with projectiles, unless you use Peach's counter. The Pink side uses all projectile attacks, so it is best to use Fox's reflector. If you get too far away from him, he will jump up and try to squash you.
Tabuu
Tabuu is the main villain of the game. He has a blue-fluorescent color and a real human shape.
He turned every Character into a trophy but Kirby, Luigi, and Ness were restored by badges from King Dedede. He was about to do it again but Sonic stopped it from doing it.
Expect him to be a hard foe because he is the last boss but luckily you will be able to fight as almost everyone (even villains and heroes) and have six characters to select(Pick Wisely).
He has many powerful attacks. The one you should be most aware of is when he spreads his wings and creates 3 waves. It is a one-hit kill and is very hard to dodge!
Master Hand
Although not a boss in the Subspace Emissary, he is fought during the Boss Battles. Same as Before in Melee just with random health like from 150% to 330%.
Crazy Hand
Although not a boss in the Subspace Emissary, he is fought during the Boss Battles. Same as before only with random health from 150% to 330%.