It's not. You can only face them in the Subspace Emissary or Boss Battles.
Ridley isn't playable in brawl but can be battled in boss battles or the subspace emissary.
If you are refering to the bosses, such as Petey Piranha, Ridley, Meta Ridley, Porky and Rayquaza, they are bosses from other games. Ridley, for instance, is a Boss in the Samus Games.
Petey Pirahna Rayquaza Duon Ridley Galeon Porky Meta Ridley Tabuu Those are the 8 bosses in Subspace Emissary. (Not in order) There are two bosses in ''Boss Battles'' that are not in Subspace, which are: Master Hand Crazy Hand
All bosses can be battled either in the subspace emissary or boss battle mode.
You have to complete the Subspace Emissary.
Get to the end of Classic or Adventure (Subspace Emissary) on any difficulty.
No. You can unlock Ridley And Tabuu, Here's how: Ridley:Defeat Tabuu (Adv. not boss battles) 3 consecutive times with samus as your first pick without dying Tabuu:Defeat The Subspace Emissary (not just tabuu, everything else) 30 times with at least hard difficulty, play 1,000,000 Brawls, Use 10,000 final smashes.
Arnold Ridley's birth name is William Arnold Ridley.
Read Ridley's birth name is Read W. Ridley.
Walter Ridley's birth name is Walter John Ridley.
Lin Ridley's birth name is Linward C. Ridley.
The definition of the word 'Ridley' is A small turtle from tropical seas. There are two separate species of Ridley Sea Turtles, Kemp's Ridley Sea Turtle and the Olive Ridley Sea Turtle.