Legendary Hunting
This guide has been merged into the Grinding guide, and will no longer be kept up to date.
Link to Grinding Guide.
Overview
Wild legendary Pokemon are always encountered at level 85.
They have regular, non-maxed PP.
(This is due to a recent bug; they would normally have 5x maxed PP).
Their movesets usually consist of the 4 highest level-up moves for their level, but not always.
(This is also due to a recent bug; they would normally always have the 4 highest level-up moves).
Note: the above bugs could be fixed at any point. I will do my best to keep this guide up-to-date.
Legendaries
Tail Wind / Ice Beam / Blizzard / Roost
Located in Seafoam Islands with a Feather of Articuno held by your active lead Pokemon. Also located in Water Temple (Feather not required, but the Enhanced version boost still applies) and has a low chance to spawn in Altering Cave (Feather not required, Enhanced version boost does not apply).
Paralyze with a Thunder Wave from Blissey / Milotic, and if needed switch to Shedinja who is immune to all damaging moves.
Roost / Thunder / Drill Peck / Light Screen
Located in Power Plant Basement with a Feather of Zapdos held by your active lead Pokemon. Also located in N Castle (Feather not required, but the Enhanced version boost still applies) and has a low chance to spawn in Altering Cave (Feather not required, Enhanced version boost does not apply).
Due to its Electric typing, it cannot be paralyzed. It's also not worth sleeping as every sleep user is weak to Drill Peck. Good walls include Magnezone, Rhyperior, Steelix, Golem, or Gliscor with Poison Heal and a Toxic Orb.
Heat Wave / Solar Beam / Sky Attack / Roost
Located in Mt. Ember/Mt. Silver with a Feather of Moltres held by your active lead Pokemon. Also located in N Castle (Feather not required, but the Enhanced version boost still applies) and has a low chance to spawn in Altering Cave (Feather not required, Enhanced version boost does not apply).
Rotom-Heat resists all moves, can paralyze using Thunder Wave and heal using Pain Split. Alternatively, a physically defensive Arcanine, Dragonite or Salamence can take hits reasonably well. A Blissey can also be used to get the initial paralysis with Thunder Wave.
Ancient Power / Amnesia / Me First / Baton Pass
Located on Faraway Island, which consists of 12 islands, only one of them containing Mew. Changes daily. Must have beaten the Johto Elite 4 and have an Old Sea Map in your inventory.
Paralyze with any high level bulky Pokemon that is not weak to Rock. Most bulky Steel types are easily able to take hits, such as Steelix, Excadrill, Bastiodon and Probopass.
Thunder / Thunder Fang / Rain Dance / Calm Mind
Located in Mossy Cave Thunder Cavern. Also has a low chance to spawn in Altering Cave. Thunder Stone (Enhanced) can be used to boost encounter rate, but this boost does not apply in Altering Cave.
Due to its Electric typing, it cannot be paralyzed. Shedinja completely walls it.
Calm Mind / Fire Blast / Fire Fang / Swagger
Located in Mossy Cave Fire Cavern. Also has a low chance to spawn in Altering Cave. Fire Stone (Enhanced) can be used to boost encounter rate, but this boost does not apply in Altering Cave.
Paralyze with any high level bulky Pokemon that is not weak to Fire. Houndoom with Flash Fire completely walls it.
Extrasensory / Hydro Pump / Calm Mind / Blizzard
Located in Mossy Cave Water Cavern. Also has a low chance to spawn in Altering Cave. Water Stone (Enhanced) can be used to boost encounter rate, but this boost does not apply in Altering Cave.
Paralyze with any high level bulky Pokemon that is not weak to Water/Ice. Shedinja completely walls it.
Heal Block / Future Sight / Healing Wish / Leaf Storm
Located on the Easter Event Maps during the Easter Event each year.
Paralyze with any high level bulky Pokemon that is not weak to Grass/Psychic. Shedinja completely walls it. Healing Wish will fail.
Lock-On / Zap Cannon / Superpower / Hyper Beam
Extremely rare chance to find in any mining rock provided your mining level is 75+. Also has a low chance to spawn in Altering Cave.
Paralyze with any high level bulky Pokemon. Shedinja completely walls it.
Lock-On / Zap Cannon / Superpower / Hyper Beam
Extremely rare chance to find in any mining rock provided your mining level is 75+. Also has a low chance to spawn in Altering Cave.
Paralyze with any high level bulky Pokemon. Shedinja completely walls it.
Lock-On / Zap Cannon / Superpower / Hyper Beam
Extremely rare chance to find in any mining rock provided your mining level is 75+. Also has a low chance to spawn in Altering Cave.
Paralyze with any high level bulky Pokemon. Shedinja completely walls it.
Dragon Pulse / Psychic / Guard Split / Zen Headbutt
After defeating Hoenn Elite 4, you will receive an Eon Ticket. This ticket, when double-clicked, will reveal the location of Latias. The location will be a random area in Hoenn and changes daily at 0:00 UTC. Defeating Hoenn Elite 4 is required.
Paralyze with any high level bulky Pokemon that is not weak to Psychic/Dragon. Shedinja completely walls it.
Dragon Pulse / Psychic / Power Split / Zen Headbutt
After defeating Hoenn Elite 4, you will receive an Eon Ticket. This ticket, when double-clicked, will reveal the location of Latios. The location will be a random area in Hoenn and changes daily at 0:00 UTC. Defeating Hoenn Elite 4 is required.
Paralyze with any high level bulky Pokemon that is not weak to Psychic/Dragon. Shedinja completely walls it.
Extrasensory / Amnesia / Future Sight / Yawn
After defeating Sinnoh Elite 4, you will receive a Lunar Ticket. This ticket, when double-clicked, will reveal the location of Uxie. The location will be a random area in Sinnoh and changes daily at 0:00 UTC. Defeating Sinnoh Elite 4 is required.
Paralyze with any high level bulky Pokemon that is not weak to Psychic. Shedinja completely walls it.
Extrasensory / Charm / Future Sight / Lucky Chant
After defeating Sinnoh Elite 4, you will receive a Lunar Ticket. This ticket, when double-clicked, will reveal the location of Mesprit. The location will be a random area in Sinnoh and changes daily at 0:00 UTC. Defeating Sinnoh Elite 4 is required.
Paralyze with any high level bulky Pokemon that is not weak to Psychic. Shedinja completely walls it.
Explosion / Extrasensory / Future Sight / Nasty Plot
After defeating Sinnoh Elite 4, you will receive a Lunar Ticket. This ticket, when double-clicked, will reveal the location of Azelf. The location will be a random area in Sinnoh and changes daily at 0:00 UTC. Defeating Sinnoh Elite 4 is required.
Due to Explosion, it's essential you use a Pokemon with Damp. However, no Pokemon with Damp exist that can also comfortably take boosted Psychic-type attacks.
Use a specially defensive Jellicent, Politoed or Swampert. Make sure it has the Damp ability, the move Confide and ideally a Leftovers. The goal here is to keep the boosting to a minimum using Confide.
If you decide to use Jellicent, then using Trick to pass a choice item, thereby locking it into one move, is also an option. Just be aware that, if you lock them into one move, when that move runs out of PP, they will start to struggle.
Crunch / Scary Face / Lava Plume / Metal Sound
Located on Stark Mountain, which is on Battle Island, reachable by ferry after defeating the Sinnoh Elite 4.
Due to Metal Sound, as well as potential Defense drops from Crunch, a safe option would be a bulky Tentacruel/Regirock with Clear Body or a bulky Torkoal with White Smoke. Intimidate users such as Gyarados and Arcanine also work, but you may need to switch out and back in to reset Defense drops.
Payback / Zen Headbutt / Wide Guard / Revenge
Located in Ancient Dungeon, a challenging area where the wild Pokemon have boosted stats.
It can hit hard after Slow Start wears off, and no Pokemon exist which can resist all of it's moves, so physically bulky Pokemon that aren't weak to Dark/Psychic/Fighting are your best bet. Examples include Arcanine, Gyarados, Hippowdon, Skarmory, Forretress, Torkoal.
Hex / Shadow Force / Shadow Claw / Aura Sphere
Located in Haunted Cave B1 during Halloween events. This area requires 600 unique Pokemon registered as caught in your Pokedex to enter.
Walled by any Normal-type that can tank Aura Sphere, such as a specially defensive Chansey or Blissey.
It can hit hard after Slow Start wears off, and no Pokemon exist which can resist all of it's moves, so physically bulky Pokemon that aren't weak to Dark/Psychic/Fighting are your best bet. Examples include Arcanine, Gyarados, Hippowdon, Skarmory, Forretress, Torkoal.
Slash / Future Sight / Aurora Beam / Mist
Located on Deep Full Moon Island, reachable by ferry after defeating the Sinnoh Elite 4.
Paralyze with any high level bulky Pokemon that is not weak to Psychic/Ice. Shedinja completely walls it.
Aqua Ring / Dive / Rain Dance / Heart Swap
Located in the Water Temple. Can be be found only by fishing, requiring a fishing level of 80.
Paralyze with any high level bulky Pokemon that is not weak to Water. Shedinja or any Pokemon with Water Absorb completely walls it.
Dream Eater / Nasty Plot / Dark Void / Haze
Located on Deep New Moon Island, reachable by ferry after defeating the Sinnoh Elite 4. If you have 400 unique Pokemon registered as caught in your Pokedex, you can also hunt Darkrai in Haunted Mansion 2F during Halloween events.
It can only do damage to targets that are asleep, so any Pokemon with Insomnia or Vital Spirit will completely wall it.
Sweet Kiss / Energy Ball / Aromatherapy / Air Slash
Located in Flower Paradise. Also has a low chance to spawn in Altering Cave.
Any bulky Steel type or Zapdos will handle it pretty well.
Close Combat / Nature Power / Misty Terrain / Psych Up
Located on the Christmas Event Maps during the Christmas Event each year.
Shedinja completely walls it.
Dragon Rush / Psychic / Sucker Punch / Focus Blast
Located in the Haunted Mansion 1F during the Halloween Event.
Shedinja completely walls it (just don't get baited into Sucker Punch).
Explosion / Overheat / Hydro Pump / Body Slam
Located on the Summer Event Maps during the Summer Event each year.
A Jellicent or Kingdra, invested in Special Defense and with the Damp ability, will counter Explosion and take minimal damage from its powerful STAB attacks.