Every paired game release in Pokémon history has had version-exclusive Pokémon. Version-exclusive Pokémon cannot be found in every game in a 'set' of games, requiring the player to trade with players with other games in the set to complete their Pokédex. This page lists the version-exclusive Pokémon in Omega Ruby and Alpha Sapphire, and makes note of some other version-specific Pokémon attributes.
Several species of Pokémon are altogether unavailable without trading with other games. This list shows which Pokémon are only available in some (but not all) of Omega Ruby and Alpha Sapphire. This does not include Pokémon that evolve via trade, even though they are technically "unavailable without trading".
With the initial paired versions of a set of Pokémon games, it is usually the case that there are 'paired Pokémon' that are available in the same areas between the two games, but one Pokémon in the pair is exclusive to one game and the other is exclusive to the other game. The table below shows the paired Pokémon in Omega Ruby and Alpha Sapphire.
Although, normally, Latios is only obtainable in Omega Ruby and Latias in Alpha Sapphire, the other one of the two can be obtained on Southern Island with the use of the Eon Ticket item, accessible either from an event between 2004 and 2015 or by using StreetPass with a copy of Omega Ruby or Alpha Sapphire that has access to Southern Island.
| Omega Ruby | Alpha Sapphire | ||
|---|---|---|---|
|
|
Seedot |
|
Lotad |
|
|
Nuzleaf |
|
Lombre |
|
|
Shiftry |
|
Ludicolo |
|
|
Mawile |
|
Sableye |
|
|
Zangoose |
|
Seviper |
|
|
Solrock |
|
Lunatone |
|
|
Latios |
|
Latias |
|
|
Groudon |
|
Kyogre |
|
|
Kabuto |
|
Omanyte |
|
|
Kabutops |
|
Omastar |
|
|
Ho-Oh |
|
Lugia |
|
|
Shieldon |
|
Cranidos |
|
|
Bastiodon |
|
Rampardos |
|
|
Shellos (West) |
|
Shellos (East) |
|
|
Gastrodon (West) |
|
Gastrodon (East) |
|
|
Palkia |
|
Dialga |
|
|
Throh |
|
Sawk |
|
|
Archen |
|
Tirtouga |
|
|
Archeops |
|
Carracosta |
|
|
Tornadus |
|
Thundurus |
|
|
Reshiram |
|
Zekrom |
|
|
Skrelp |
|
Clauncher |
|
|
Dragalge |
|
Clawitzer |
Giratina can only be encountered in the Sky if the player has a Palkia obtained in Omega Ruby and a Kyogre obtained in Alpha Sapphire.
Landorus can only be encountered in the Sky if the player has a Tornadus obtained in Omega Ruby and a Thundurus obtained in Alpha Sapphire.
Kyurem can only be encountered in the Gnarled Den if the player has a Reshiram obtained in Omega Ruby and a Zekrom obtained in Alpha Sapphire.
Several Pokémon may be available in all games, but have different encounter methods depending on the game. The full list is shown below.
| Pokémon | Games | Encounter Methods | ||
|---|---|---|---|---|
 |
Plusle | OR | AS | Horde |
| OR | AS | Walking, Horde | ||
 |
Minun | OR | AS | Walking, Horde |
| OR | AS | Horde | ||
 |
Grimer | OR | AS | Walking |
| OR | AS | Walking, Horde | ||
 |
Koffing | OR | AS | Walking, Horde |
| OR | AS | Walking | ||
Several Pokémon may be available in multiple games, but have different encounter rates or locations that cause them to become more common in one game than another. Those Pokémon are listed here, though only with the wild locations that are subject to this preferential treatment.
| Pokémon | Games | Encounter Methods | ||
|---|---|---|---|---|
|
|
Minun | OR | AS |
Walking: Route 110 Horde: Route 110 (40%) |
| OR | AS | Horde: Route 110 (5%) | ||
|
|
Plusle | OR | AS | Horde: Route 110 (5%) |
| OR | AS |
Walking: Route 110 Horde: Route 110 (40%) |
||
|
|
Koffing | OR | AS |
Walking: Fiery Path (30%) Horde: Fiery Path |
| OR | AS | Walking: Fiery Path (5%) | ||
|
|
Grimer | OR | AS | Walking: Fiery Path (5%) |
| OR | AS |
Walking: Fiery Path (30%) Horde: Fiery Path |
||
 |
Illumise | OR | AS | Walking: Route 117 (20%) |
| OR | AS | Walking: Route 117 (4%) | ||
 |
Volbeat | OR | AS | Walking: Route 117 (4%) |
| OR | AS | Walking: Route 117 (20%) | ||