Support Spirit: Dr. Wily

Character history:
Dr. Albert W. Wily was the main antagonist of the first Mega Man series, in which he attempts to take over the world by reprogramming robots created by his rival Dr. Light. A stereotypical mad scientist, Dr. Wily has tried again and again to take over the world, but is stopped short by Mega Man just as often. In Super Smash Bros. 4, Dr. Wily appeared as a collectible trophy.

Dr. Wily as a trophy in Smash Bros. for 3DS.

In World of Light:

Type: Support Spirit

Stars: 4

Ability: Slows opponent's Final Smash meter's charge rate

Difficulty: Hard

Found in the Metal Gear base, Dr. Wily is arguably harder to 'cheat' then the Pauline battle, but {in my opinion } not quite as infuriating. To win, you must beat 8 metal Mega Mans, who appear in pairs. Get past them, and you'll then have to face Dr. Mario. Getting past the team of Mega Mans is difficult, but their are a number of methods that can be used. Certain spirits can make the battle easier, such as Viridi, who can deal more damage against metal opponents. The spirit Great Fairy can recover a large chunk of your health. And as this is a stamina battle, any support spirit that buffs your health is useful.

As for characters, I found using Ness or Lucas and spamming Down B, or their PSI magnet, can make the fight much easier, as Mega Man will just keep shooting projectiles, which you can use to heal. Other strategies include:

-Using Peach's neutral special counter and Final Smash to heal

-Kirby's up special to dodge projectiles

-Use Fox or Falco's reflector.

Support Spirit: Pauline

Character history:
Pauline started as the damsel-in-distress in the original arcade game 'Donkey Kong,' under the name 'lady'. Pauline then went on to appear multiple times in the Mario vs Donkey Dong series. Pauline has also made cameos in previous Super Smash Bros. titles, including as a sticker in Brawl, as a trophy in Smash 4, and in the background of the stage 'New Donk City Hall' in Ultimate.

Pauline's most notable recent appearance was in Super Mario Odyssey, released in 2017. Pauline appears as the Mayor of the fictional location 'New Donk City'.

In World of Light:
Type: Support spirit
Stars: 4
Ability: Recovers health when enemy attacks are shielded
Difficulty: Hard

One of the most recognizable spirit battles in Ultimate, and not because of the joy it brings. The objective is to take out peach, who will try to flee. Given that the fight takes place on 75m, with reduced jump power and with a time limit, this is difficult enough by itself.But you also have to worry about Mario and Giant Donkey Kong, who can kill you in just a few hits. Fortunately, there is a way round this. Select a spirit that grants you a staff ( such as Cupid ) and take out Peach quickly from the far side of the map. Given the size of the stage, the staff is extremely effective.

If you don't have the right spirits, or you want bragging rights ( or you have a death wish ), this fight can be done spiritless. The best method I found involves the following steps:
1) Choose a character with a ranged grab (or 'tether grab' ), such as Samus.
2) When the match starts, immediately head for the top left corner of the map.
3) When Mario approaches with the hammer, grab him and throw him past the blast zone.
4) You should have about 5 seconds. Make sure their are no items on the top platform.
5) Donkey Kong will appear, and, if there are no nearby items, will head straight towards you.
6) This doesn't always work, but if you can manage to grab him close to the blast zone, you can throw him straight into the blast zone.
7) With Mario and Donkey Kong both gone, you now can now pursue peach.
8) Use Bunny Hoods, Timers and whatever you can find to take out peach.
8.b) Or, hope she miraculously SDs ( self-destructs ) in her attempts to escape. This does occasionally happen.