In Alola, a wild Pokémon in trouble does not go down quietly: it calls for help, and a second Pokémon bursts out of the grass. The game calls this mechanic the SOS Battle; players often talk about SOS calls. Annoying when you want to catch something, it becomes valuable once you master it.

📢The basics

  • After the first Trial, Ilima’s, wild Pokémon can call for a reinforcement during battle. The battle then becomes a two-on-one.
  • You cannot catch anything while two wild Pokémon are present. You first have to knock one of them out.
  • The reinforcement is often a Pokémon of the same species, but not always: some call their evolution or an entirely different species.
  • Effort points gained are doubled as long as the chain lasts.

🎯Triggering or avoiding reinforcements

A wild Pokémon calls for help more often when its HP is low, and even more often if your Pokémon has the Ability Intimidate, Pressure or Unnerve, or if you use an Adrenaline Orb, a single-use item that triggers calls. It never calls if it is asleep, paralyzed or suffering from another status condition: that is the best way to catch it in peace.

🐾Pokémon that only appear as reinforcements

Some Pokémon can only be met in SOS Battles: Chansey called by a Cleffa or an Elekid, Mareanie called by a Corsola, Gyarados called by a Magikarp… In rain, hail or a sandstorm, other Pokémon, such as Goomy, Castform or Vanillish, may answer the call. Here are all the reinforcements recorded in the locations of Alola.

123 encounters

PokémonLocationLevelsVersions
CaterpieMelemele Meadow (called by Metapod)9-12Both
CaterpieLush Jungle (called by Metapod)18-21Both
CaterpieRoute 1 (area 3) (called by Metapod)3-5Both
CaterpieRoute 1 (area 4) (called by Metapod)10-13Both
CaterpieRoute 5 (area 1) (called by Metapod)13-16Both
CaterpieRoute 5 (area 2) (called by Metapod)18-21Both
ButterfreeMelemele Meadow (called by Caterpie ; called by Metapod)9-12Both
ButterfreeLush Jungle (called by Caterpie ; called by Metapod)18-21Both
ButterfreeRoute 5 (area 1) (called by Caterpie)13-16Both
ButterfreeRoute 5 (area 2) (called by Caterpie ; called by Metapod)18-21Both
PikachuHau’oli City (shopping area) (called by Pichu)5-8Both
PikachuRoute 1 (area 3) (called by Pichu)3-5Both
ClefairyMount Hokulani (at night, called by Cleffa)25-28Both
JigglypuffRoute 4 (by day, called by Igglybuff)11-14Both
JigglypuffRoute 6 (area 1) (by day, called by Igglybuff)14-17Both
JigglypuffRoute 6 (area 2) (by day, called by Igglybuff)14-17Both
PoliwhirlMalie Garden24-27Both
PoliwrathMalie Garden (by day)24-27Both
SlowbroKala’e Bay (called by Slowpoke)15-18Both
GengarAbandoned Thrifty Megamart (called by Haunter)29-32Both
ChanseyPoni Grove (called by Riolu)52-55Both
ChanseyBlush Mountain (called by Elekid)27-30 / 26-29Both
ChanseyMount Hokulani (at night, called by Cleffa)25-28Both
ChanseyRoute 12 (Area 1) (called by Elekid)26-29Both
ChanseyRoute 12 (Area 2) (called by Elekid)25-28Both
KangaskhanWela Volcano Park (called by Cubone)16-19Both
SeakingBrooklet Hill (water) (called by Goldeen)10-15Both
SeakingMalie Garden (called by Goldeen)10-27Both
StarmieRoute 7 (called by Staryu)10-19Both
ElectabuzzBlush Mountain (called by Elekid)27-30 / 26-29Both
ElectabuzzRoute 12 (Area 1) (called by Elekid)26-29Both
ElectabuzzRoute 12 (Area 2) (called by Elekid)25-28Both
MagmarWela Volcano Park (called by Magby)16-19Both
TaurosPoni Plains (Area 1) (called by Miltank)54-57Both
TaurosPoni Plains (area 2) (called by Miltank)54-57Both
TaurosPoni Plains (area 3) (called by Miltank)54-57Both
TaurosPoni Plains (Area 4) (called by Miltank)54-57Both
TaurosPaniola Ranch (called by Miltank)12-15Both
GyaradosKala’e Bay (called by Magikarp)10-15Both
GyaradosPoni Gauntlet (called by Magikarp)10-59Both
GyaradosBrooklet Hill (Totem’s Den) (called by Magikarp)10-15Both
GyaradosBrooklet Hill (water) (called by Magikarp)10-15Both
GyaradosAkala Outskirts (called by Magikarp)10-23Both
GyaradosSecluded Shore (called by Magikarp)10-30Both
GyaradosVast Poni Canyon (called by Magikarp)10-44Both
GyaradosSeaward Cave (called by Magikarp)10-15Both
GyaradosPoni Meadow (called by Magikarp)10-57Both
GyaradosMelemele Sea (called by Magikarp)10-18Both
GyaradosPaniola Town (called by Magikarp)10-18Both
GyaradosMalie Garden (called by Magikarp)10-27Both
GyaradosPoni Wilds (called by Magikarp)10-43Both
GyaradosRoute 13 (called by Magikarp)10-30Both
GyaradosRoute 14 (called by Magikarp)10-31Both
GyaradosRoute 15 (called by Magikarp)10-33Both
GyaradosRoute 7 (called by Magikarp)10-19Both
GyaradosRoute 8 (called by Magikarp)10-20Both
GyaradosRoute 9 (called by Magikarp)10-23Both
GyaradosPoni Breaker Coast (called by Magikarp)10-43Both
GyaradosSeafolk Village (called by Magikarp)10-43Both
SnorlaxRoute 1 (area 4) (called by Munchlax)10-13Both
DragonairPoni Gauntlet (called by Dratini)10-59Both
DragonairVast Poni Canyon (called by Dratini)10-44Both
DragonairPoni Meadow (called by Dratini)10-57Both
DragonitePoni Gauntlet (called by Dratini)10-59Both
CrobatResolution Cave (called by Golbat)54-57Both
SudowoodoLush Jungle (called by Bonsly)18-21Both
SudowoodoRoute 1 (area 4) (called by Bonsly)10-13Both
SudowoodoRoute 5 (area 2) (called by Bonsly)18-21Both
PolitoedMalie Garden (at night)24-27Both
EspeonRoute 4 (called by Eevee)11-14Both
EspeonRoute 6 (area 1) (called by Eevee)14-17Both
EspeonRoute 6 (area 2) (called by Eevee)14-17Both
MiltankPoni Plains (Area 1) (called by Tauros)54-57Both
MiltankPoni Plains (area 2) (called by Tauros)54-57Both
MiltankPoni Plains (area 3) (called by Tauros)54-57Both
MiltankPoni Plains (Area 4) (called by Tauros)54-57Both
MiltankPaniola Ranch (called by Tauros)12-15Both
SableyeTen Carat Hill (inside the cave) (called by Carbink)10-13Both
SableyeVast Poni Canyon (called by Carbink)41-44Both
WailordPoni Wilds (called by Wailmer)10-43Both
WailordPoni Breaker Coast (called by Wailmer)10-43Both
WailordSeafolk Village (called by Wailmer)10-43Both
WhiscashPoni Gauntlet (called by Barboach)10-59Both
WhiscashVast Poni Canyon (called by Barboach)10-44Both
WhiscashSeaward Cave (called by Barboach)10-15Both
WhiscashPoni Meadow (called by Barboach)10-57Both
WhiscashPaniola Town (called by Barboach)10-18Both
CastformHaina Desert28-31Both
CastformLush Jungle18-21Both
CastformMount Lanakila42-45Both
CastformMalie Garden24-27Both
CastformRoute 1731-34Both
CastformTapu Village28-31Both
CastformExeggutor Island40-43Both
GlalieMount Lanakila (called by Snorunt)42-48 / 42-45Both
ShelgonKala’e Bay (called by Bagon)15-18Both
SalamenceRoute 3 (area 2) (called by Bagon)9-12Both
HappinyHau’oli City (shopping area) (called by Pichu)5-8Both
HappinyLush Jungle (called by Bonsly)18-21Both
HappinyWela Volcano Park (called by Magby)16-19Both
HappinyRoute 1 (area 3) (called by Pichu)3-5Both
HappinyRoute 1 (area 4) (called by Bonsly ; called by Munchlax)10-13Both
HappinyRoute 4 (by day, called by Igglybuff)11-14Both
HappinyRoute 5 (area 2) (called by Bonsly)18-21Both
HappinyRoute 6 (area 1) (by day, called by Igglybuff)14-17Both
HappinyRoute 6 (area 2) (by day, called by Igglybuff)14-17Both
GabiteHaina Desert28-31Both
LucarioPoni Grove (called by Riolu)52-55Both
GarbodorOuter Cape (called by Trubbish)24-27Both
VanilliteTapu Village28-31Both
VanillishMount Lanakila42-48Both
PangoroRoute 10 (called by Pancham)24-27Both
PangoroRoute 11 (called by Pancham)24-27Both
PangoroRoute 17 (called by Pancham)31-34Both
GoomyLush Jungle18-21Both
GoomyRoute 1731-34Both
SliggooExeggutor Island40-43Both
PikipekRoute 8 (called by Trumbeak)17-20Both
TrumbeakLush Jungle (called by Passimian ; called by Oranguru)18-21Both
MareanieMelemele Sea (called by Corsola)10-18Both
MareanieRoute 9 (called by Corsola)10-23Both
Hakamo-oVast Poni Canyon (called by Jangmo-o)41-44Both
Kommo-oVast Poni Canyon (called by Jangmo-o)41-44Both

🔁Why chains matter

The more reinforcements you chain in a single battle, the more likely newly called Pokémon are to have perfect IVs, their Hidden Ability, or even to be Shiny. It is the favorite technique of demanding players. Our guide SOS Battle chains details the method and the numbers.