Mass outbreak

My Pokémon Ranch explaining the general mechanics of a mass outbreak

Mass outbreaks (Japanese: 大量発生 mass outbreak), also known as swarms, Pokémon outbreaks, or wild outbreaks, are a feature introduced in Generation II that allows the player to catch Pokémon that are usually rare or otherwise unobtainable. They appear from Generations II to V.

In the games

Generation II

In Generation II, if the player registered a certain Trainer in the Pokégear, that Trainer occasionally calls to tell the player that they saw or heard about a large number of Pokémon in a certain area. Until midnight (in-game time), the swarming Pokémon appear in the given area with much greater frequency than the usual 1%. Only one swarm can appear per day. The player can force a particular swarm to appear if a swarm has not already appeared that day by first deleting all possible phone numbers except the swarm Trainer's and then repeatedly toggling Daylight Savings Time by speaking with the player's Mom in New Bark Town. There is a 50% chance of triggering a phone call every time DST is changed.

Pokémon Gold, Silver, and Crystal

# Pokémon Location Levels Notifier Game
183   Marill Mt. Mortar 13-15 Hiker Parry (Route 45) G S C
193   Yanma Route 35 12-14 Bug Catcher Arnie (Route 35) G S C
206   Dunsparce Dark Cave 2-4 Hiker Anthony (Route 33) G S C
209   Snubbull Route 38 16 Schoolboy Chad (Route 38) G S C
211   Qwilfish Route 32
Old/Good/Super Rod
Fisher Ralph (Route 32) G S C
223   Remoraid Route 44
Old/Good/Super Rod
Fisher Wilton (Route 44) G S C

Generation III

In Generation III, in addition to making rare Pokémon temporarily more common, this feature can be combined with record mixing to allow the player to catch Pokémon that cannot be caught at all normally. Pokémon encountered through mass outbreaks will also have a predefined set of moves.

After entering the Hall of Fame, every time the player wins a battle, there is a ~0.5% (328/65536) chance that the game will generate an outbreak; this does not apply to link battles, e-Reader battles, the Safari Zone, or the Battle Tower/Frontier. After an outbreak is generated, the television program announcing it will appear the next day. Once the television program has been watched, the outbreak becomes active.[1] Outbreaks last until the end of the day after they became active, during which time the swarming Pokémon will have an appearance rate of 50%.

The record mixing feature of Pokémon Ruby, Sapphire, and Emerald allows players to give an outbreak they've seen to other players, regardless of whether that outbreak would naturally occur in the player's game. The traded outbreaks will be announced on television in the following days after mixing records.

Pokémon Ruby, Sapphire, and Emerald

# Pokémon Location Levels Game Moves
283   Surskit Route 102 3 R S E
Bubble Quick Attack
Route 114 15 R S E
Bubble Quick Attack
Route 117 15 R S E
Bubble Quick Attack
Route 120 28 R S E
Bubble Quick Attack
300   Skitty Route 116 15 R S E
Growl Tackle
8 R S E
Growl Tackle
Tail Whip Attract
273   Seedot Route 102 3 R S E
Bide Harden
Leech Seed
Route 117 13 R S E
Harden Growth
Nature Power Leech Seed
Route 120 25 R S E
Giga Drain Frustration
SolarBeam Leech Seed
274   Nuzleaf Route 114 15 R S E
Harden Growth
Nature Power Leech Seed

Generation IV

Mass outbreaks were largely expanded in Generation IV. Once the player attains the National Pokédex and has entered the Hall of Fame, a "swarm of Pokémon" will appear every day in a particular location, which changes the probability of finding the given Pokémon from 0% to 40%. Outbreaks last only one day and are random events. Information about mass outbreaks can be found in Sandgem Town by talking to Lucas/Dawn's sister or by watching the Sinnoh television DPPt, or by listening to Professor Oak's Pokémon Talk HGSS.

When players all join the same group, they will all experience the same outbreak on any given day.

The species of an outbreak seems to be determined using a formula, because it is not chosen randomly when the player starts the game that day. Even if the date is edited, the next swarm will always be the same. It is also possible that the species is determined the day before, though there is no additional evidence to support this. If the DS clock is changed or a different DS is used, then the game will detect this and will not change the species swarming until 12:00 AM.

Pokémon Diamond, Pearl, and Platinum

Many of the Pokémon obtained through mass outbreaks are outside of the Sinnoh Pokédex, and are usually otherwise exclusive to other regions.

Due to the high encounter chances for Pokémon that appear during outbreaks, they make for longer and better chains when using the Poké Radar.

# Pokémon Location Levels Game
016   Pidgey Route 229 51 D P Pt
081   Magnemite Fuego Ironworks 28-29 D P Pt
083   Farfetch'd Route 221 28, 29Pt D P Pt
084   Doduo Route 201 2 D P Pt
096   Drowzee Route 215 19Pt, 20, 21DP D P Pt
098   Krabby Route 226 52 D P Pt
48-49 D P Pt
100   Voltorb Route 218 28, 29Pt D P Pt
104   Cubone Route 203 4 D P Pt
108   Lickitung Lake Valor 34, 36 D P Pt
127   Pinsir Route 229 48-49 D P Pt
177   Natu Route 224 53 D P Pt
50 D P Pt
206   Dunsparce Route 208 16 D P Pt
18 D P Pt
209   Snubbull Route 209 16 D P Pt
18-19 D P Pt
220   Swinub Route 217 34 D P Pt
222   Corsola Route 230 50 D P Pt
48 D P Pt
225   Delibird Route 216 32 D P Pt
Route 217 32-33 D P Pt
231   Phanpy Route 207 5, 7Pt D P Pt
238   Smoochum Lake Acuity 35 D P Pt
246   Larvitar Route 206 16 D P Pt
263   Zigzagoon Route 202 3 D P Pt
283   Surskit Lake Verity 2 D P Pt
287   Slakoth Eterna Forest 10, 11Pt D P Pt
296   Makuhita Route 225 50-51 D P Pt
48-49 D P Pt
299   Nosepass Route 206 14 D P Pt
300   Skitty Route 222 39Pt, 40 D P Pt
309   Electrike Valley Windworks 7 D P Pt
9-10 D P Pt
325   Spoink Route 214 21Pt, 22, 23DP D P Pt
327   Spinda Route 227 55 D P Pt
53-54 D P Pt
359   Absol Route 213 20 D P Pt
374   Beldum Route 228 53 D P Pt
51-52 D P Pt

Pokémon HeartGold and SoulSilver

The feature continues to appear in HeartGold and SoulSilver, where the wild Pokémon available include all those from Generation II, plus Ditto, Chansey, and Pokémon from Hoenn and Sinnoh. Information on swarms can now be found by listening to Professor Oak's Pokémon Talk on the Pokégear radio.

# Pokémon Location Levels Game
113   Chansey Route 13 23 HG SS
132   Ditto Route 47 34 HG SS
183   Marill Mt. Mortar 15 HG SS
193   Yanma Route 35 12 HG SS
206   Dunsparce Dark Cave 2-3 HG SS
209   Snubbull Route 38 16 HG SS
211   Qwilfish Route 32 40 HG SS
223   Remoraid Route 44 20 HG SS
261   Poochyena Route 1 2 HG SS
278   Wingull Vermilion City
35 HG SS
280   Ralts Route 34 10-11 HG SS
302   Sableye Route 9 13-15 HG SS
303   Mawile Route 9 13-15 HG SS
316   Gulpin Route 3 5 HG SS
333   Swablu Route 45 23 HG SS
340   Whiscash Violet City
Old/Good/Super Rod
343   Baltoy Route 3 5 HG SS
366   Clamperl Route 19
35 HG SS
369   Relicanth Route 12
Super Rod
370   Luvdisc Route 27
20 HG SS
401   Kricketot Viridian Forest 3 HG SS
427   Buneary Route 25 8-10 HG SS

Generation V

The gates in Unova have a monitor inside that will alert the player to where an outbreak is taking place.

Unlike in previous games, mass outbreaks can be manipulated by soft resetting the game, but only if the player has not saved their game at all that day. When the game is restarted, there will be a different Pokémon swarming.

Black and White

During winter, the monitor may occasionally not report on outbreaks, which is due to parts of Route 8, where Croagunk can be found, becoming frozen during Winter and not allowing the Pokémon to be caught there. All outbreaks in these games have a level range of 15-55.

# Pokémon Location Levels Game
046   Paras Route 11 15-55 B W
056   Mankey Route 15 15-55 B W
083   Farfetch'd Route 1 15-55 B W
084   Doduo Route 12 15-55 B W
102   Exeggcute Route 18 15-55 B W
161   Sentret Route 7 15-55 B W
193   Yanma Route 14 15-55 B W
204   Pineco Route 16 15-55 B W
228   Houndour Route 9 15-55 B W
235   Smeargle Route 5 15-55 B W
236   Tyrogue Route 10 15-55 B W
261   Poochyena Route 9 15-55 B W
285   Shroomish Route 11 15-55 B W
311   Plusle Route 6 15-55 B W
312   Minun Route 6 15-55 B W
313   Volbeat Route 3 15-55 B W
314   Illumise Route 3 15-55 B W
353   Shuppet Route 13 15-55 B W
360   Wynaut Route 2 15-55 B W
449   Hippopotas Route 4 15-55 B W
453   Croagunk Route 8 15-55 B W

Black 2 and White 2

All outbreaks in these games have a level range of 40-55 and an encounter rate of 40%.

# Pokémon Location Levels Game
022   Fearow Route 15 40-55 B2 W2
079   Slowpoke Abundant Shrine 40-55 B2 W2
083   Farfetch'd Route 1 40-55 B2 W2
084   Doduo Route 12 40-55 B2 W2
097   Hypno Dreamyard 40-55 B2 W2
122   Mr. Mime Route 20 40-55 B2 W2
162   Furret Route 7 40-55 B2 W2
166   Ledian Route 22 40-55 B2 W2
168   Ariados Route 22 40-55 B2 W2
177   Natu Route 5 40-55 B2 W2
185   Sudowoodo Route 20 40-55 B2 W2
187   Hoppip Route 18 40-55 B2 W2
195   Quagsire Route 8 40-55 B2 W2
204   Pineco Route 16 40-55 B2 W2
277   Swellow Route 13 40-55 B2 W2
284   Masquerain Route 11 40-55 B2 W2
311   Plusle Route 6 40-55 B2 W2
312   Minun Route 6 40-55 B2 W2
313   Volbeat Route 3 40-55 B2 W2
314   Illumise Route 3 40-55 B2 W2
317   Swalot Route 9 40-55 B2 W2
332   Cacturne Reversal Mountain 40-55 B2 W2
450   Hippowdon Desert Resort 40-55 B2 W2

In the anime

A mass outbreak of Pikachu in the anime

In Ivysaur's Mysterious Tower!, Vermilion City was the site of a mass outbreak of Bulbasaur and Ivysaur. Ash and Goh learned that the former grassland, now the site of a new Gym, was the ideal site for the Bulbasaur line to absorb the solar energy and wind needed to undergo evolution.

In Gotta Catch a What?!, Ash and Goh ventured into the mountains to discover a reported Pikachu outbreak. They learned that Pikachu had gathered because the area was rich in Thunder Stones, helping the Pikachu, including Goh's newly caught one, evolve into Raichu en masse.

In Trials of a Budding Master!, Goh learned of a mass outbreak of Geodude at the Rock Tunnel. After arriving there with Ash, he almost immediately found one and caught it.

In other languages

Language Title
  Finnish Suuri esiintymä
  French Apparition massive
  German Massiven Auflauf
  Italian Comparse massicce
  Korean 대량발생 Daeryangbalsaeng
  Spanish Aparición masiva

See also


  This game mechanic article is part of Project Games, a Bulbapedia project that aims to write comprehensive articles on the Pokémon games.