Legendary and Mythical Pokémon are Pokémon that are exceptionally rare and often very powerful, generally featured prominently in the legends and myths of the Pokémon world. Many Legendary Pokémon are version mascots in the core series games. Mythical Pokémon were originally considered to be Legendary Pokémon as well, but they were implied to be different from Legendary Pokémon in side series game Pokémon Ranger: Guardian Signs, and later officially separated in another side series game Pokémon Super Mystery Dungeon. Most Legendary and Mythical Pokémon are unobtainable as of now.
Most Legendary and Mythical Pokémon are renowned for their stats and performance in battles. Many of these Pokémon are worshipped as gods by particular groups of people in the Pokémon world, due to the fact that these particular Pokémon have unique powers and representation of different items; an example would be Groudon, which represents lithosphere, and expanded the land.
In the core series games, most of these Pokémon can only be captured once, and the player has to trade for more of them. If the players failed to capture them, they may only have a second chance after defeating the Regional Pokémon League. However, in Pokémon Brick Bronze, Legendary and Mythical Pokémon battled in Set Encounters are available as Roaming Pokémon from version 0.10 update on 20th January, 2017 onwards, regardless if the player succeeds or fails at capturing the Pokémon during the initial encounter. Given the extremely slim chance of bumping into them as Roaming Pokémon though, players are still recommended to save beforehand and turn off Auto Save, just to secure a chance for getting the Legendary or Mythical Pokémon during the initial Set Encounter.
However, Legendary and Mythical Pokémon which are not found via battles will not be available as Roaming Pokémon. Multiple Lake Guardians can be dug up as Fossilized Eggs in Lagoona Trenches, and they are also the only Legendary Pokémon available in Eggs, while multiple Manaphy can be obtained by picking up Manaphy Eggs washed ashore when the event is held on Rosecove Beach.
Legendary and Mythical Pokémon cannot evolve, other than the newly introduced Cosmog family. They also cannot breed, except "Sea Guardians" Phione and Manaphy, both producing Phione Eggs when bred with Ditto. In the Pokédex for each generation portion, Mythical Pokémon typically appear at the very end, and Legendary Pokémon immediately before them, except Victini, which appears right before Unova Starter Pokémon.
Legendary and Mythical Pokémon are notorious for having extremely low catch rates. To catch them, start by throwing a Quick Ball, which has 5× catch rate in the 1st turn. If it fails, weaken the Pokémon with attacks that should not be able to make it faint, until its health bar is in red. Inflicting a status condition also increases the catch rate, but players are strongly discouraged from burning or poisoning the Pokémon in order to prevent knockouts.
Once the Pokémon is in critical health and is asleep, paralyzed or frozen, start throwing the most effective Poké Balls according to the situation until it is caught. For example, Dusk Balls are the most effective at night or in caves with the 3.5× catch rate. Elemental Balls can also be good back-ups by using the Pokémon's type to players' advantage, but they cost double the price of Dusk and Quick Balls, while only having the catch rate of a Dusk Ball in maximum effect.
False Swipe is a widely used attack for catching Legendary and Mythical Pokémon or any Pokémon because it is a unique attack that will never render the opponent unable to battle, though it does not affect Ghost-type Pokémon. TM54 False Swipe is available for purchase in BP Shop, Colosseum Marketplace for 45 BP. For players poor on BP, there is another option: both Axew (can be found in Path of Truth) and Scyther (can be found in Route 10 ) learn False Swipe by leveling up.
Here is a list of Legendary Pokémon which have appeared in-game. Italics indicate that the Legendary Pokémon can only be seen as of now.
|Weather Trio||Groudon||Mt. Igneus|
|Lake Guardians||Uxie||Lagoona Trenches|
|Creation Trio||Dialga||Anthian Park, Anthian City|
|Forces of Nature||Tornadus||Nature's Den → Roaming Pokémon|
|Legendary Beasts||Raikou||Cragonos Sanctuary → Roaming Pokémon|
|Eon Duo||Latias||Route 15 → Roaming Pokémon|
|Legendary Titans||Regirock||Calcite Chamber|
|Regigigas||Titans' Throng → Roaming Pokémon|
|Swords of Justice||Cobalion||Secret Grove → Roaming Pokémon|
Here is a list of Mythical Pokémon which have appeared in-game. Italics indicate that the Mythical Pokémon can only be seen as of now. Despite currently not physically appearing in the story, Hoopa is the game mascot of Pokémon Brick Bronze and is mentioned a few times in-game.
|Jirachi||Grove of Dreams|
|Phione*||Breed Manaphy with Ditto|
|Use Gracidea Flower on Land Form Shaymin during daytime|
|Diancie||Chamber of the Jewel|
|Mew Duo||Mew||Secret Lab → Roaming Pokémon|
|Swords of Justice||Keldeo||Secret Grove|
(Hinted to be on Crescent Island)
*Phione's status as a Mythical Pokémon is currently disputed, with several pieces of evidence and even official statements often contradicting each other.