Pokemon Omega Ruby and Alpha Sapphire owned by Nintendo.
Images used for educational purposes only.
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Once you acquire the National Dex in Pokemon Omega Ruby and Alpha Sapphire, which you'll unlock via Professor Birch once you deal with Groudon / Kyogre, pokemon from outside Hoenn will begin appearing on virtually every Route in the game. That said, they'll only appear via the DexNav - in other words, sneaking up on tails that are protruding out of the landscape. These will appear in conjunction with the tails of the Route's normal pokemon, so it may take a while for you to see every pokemon available on a Route.

As far as I can tell, the rarity of these pokemon does not vary. They're all equally annoying to force out of the grass / dirt / water, regardless of their species. Expect to see Route regulars far more often than foreign pokemon.

(In progress. Obvs.)

 Route 101
  • Lillipup - Grass
  • Sewaddle - Grass
  • Zorua - Grass
Route 102
  • Lillipup - Grass
  • Tympole - Grass
  • Gothita - Grass
Route 103
  • Chatot - Grass
  • Lillipup - Grass
  • Shellos - Grass (Pink in OR, Blue in AS)
Route 104
  • Chatot - Grass
  • Pidove - Grass
  • Sewaddle - Grass
Petalburg Woods
  • Cottonee - Grass
  • Paras - Grass
  • Phantump - Grass
Route 105
  • Clauncher - Surf (AS only)
  • Frillish - Sufing
  • Krabby - Surfing
  • Skrelp - Surfing (OR only)
Route 106
  • Clauncher - Surf (AS only)
  • Frillish - Sufing
  • Krabby - Surfing
  • Skrelp - Surfing (OR only)
Granite Cave
  • Axew - Walking (basement only)
  • Onix - Walking (basement only)
  • Timburr - Walking (basement only)
Route 107
  • Clauncher - Surf (AS only)
  • Frillish - Sufing
  • Krabby - Surfing
  • Skrelp - Surfing (OR only)
Route 108
  • Clauncher - Surf (AS only)
  • Frillish - Sufing
  • Krabby - Surfing
  • Skrelp - Surfing (OR only)
Route 109
  • Clauncher - Surf (AS only)
  • Frillish - Sufing
  • Krabby - Surfing
  • Skrelp - Surfing (OR only)
Route 110
  • Chatot - Grass
  • Trubbish - Grass
  • Shellos - Grass (Pink in OR, Blue in AS)
Route 111
  • Dwebble - Sand
  • Gible - Sand
  • Sandile - Sand
Fiery Path
  • Diglett - Walking
  • Roggenrola - Walking
  • Tyrogue - Walking
Route 112
  • Ponyta - Grass
  • Sawk - Grass (AS only)
  • Throh - Grass (OR only)
  • Tyrogue - Grass
Jagged Pass
  • Mankey - Grass
  • Ponyta - Grass
  • Tyrogue - Grass
Route 113
  • Bouffalant - Grass
  • Klefki - Grass
  • Scraggy - Grass
Route 114
  • Misdreavus - Grass
  • Skorupi - Grass
  • Tympole - Grass
Meteor Falls
  • Clefairy - Walking
  • Deino - Walking
  • Druddigon - Walking
Route 115
  • Clefairy - Grass
  • Misdreavus - Grass
  • Pidove - Grass
Route 116
  • Eevee - Grass
  • Pidove - Grass
  • Joltik - Grass
Route 117
  • Deerling - Grass
  • Rattata - Grass
  • Tympole - Grass
Route 118
  • Aipom - Grass
  • Luxio - Grass
  • Raticate - Grass
Route 119

 None.

 Route 120

 None.

 Scorched Slab

 None.

 Route 121
  • Aipom - Grass
  • Elgyem - Grass
  • Hypno - Grass
Route 122
  • Alamomola - Surfing
  • Finneon - Surfing
  • Frillish - Surfing
Route 123

 None.

Safari Zone

  • Buneary - Grass
  • Kakuna - Grass
  • Pidgeotto - Grass

Mt. Pyre - Interior

 None.

 Mt. Pyre - Exterior
  • Bronzor - Grass
  • Elgyem - Grass
  • Growlithe - Grass
Route 124
  • Alamomola - Surfing
  • Finneon - Surfing
  • Frillish - Surfing
Route 125
  • Seel - Surfing
  • Finneon - Surfing
  • Frillish - Surfing
Shoal Cave
  • Cubchoo - Walking
  • Delibird - Walking
  • Dewgong - Walking
Route 126
  • Alamomola - Surfing
  • Finneon - Surfing
  • Frillish - Surfing
Route 127
  • Alamomola - Surfing
  • Finneon - Surfing
  • Frillish - Surfing
Route 128
  • Alamomola - Surfing
  • Finneon - Surfing
  • Frillish - Surfing
Route 129
  • Alamomola - Surfing
  • Finneon - Surfing
  • Frillish - Surfing
Route 130
  • Alamomola - Surfing
  • Finneon - Surfing
  • Frillish - Surfing
Route 131
  • Alamomola - Surfing
  • Finneon - Surfing
  • Frillish - Surfing
Route 132
  • Alamomola - Surfing
  • Finneon - Surfing
  • Frillish - Surfing
Route 133
  • Alamomola - Surfing
  • Finneon - Surfing
  • Frillish - Surfing
Route 134
  • Alamomola - Surfing
  • Finneon - Surfing
  • Frillish - Surfing
Victory Road

None.