From Bulbapedia, the community-driven Pokémon encyclopedia.
This is a list of Pokémon in the order dictated by the Capture Styler's Browser, which acts like a Pokédex for the Fiore region, meaning that the Pokémon listed are all native to Fiore as well. All of the Pokémon are from Generation III or before.
In Pokémon Ranger, Pokémon are put into Groups, which are always one of their types from the main series. However, unlike the main series, there are no dual-types. Poké Assists are affected by the Group of the Pokémon in the capture attempt; a type advantage will make it last longer while a type disadvantage will reduce the time it lasts.
A Pokémon's Field Move is used outside of battle to overcome obstacles. All Field Moves have three levels, besides Cross and Flash, with only one. Level 2 obstacles can only be overcome by Level 2 or 3 Field Moves, and Level 3 obstacles can only be overcome by Level 3 Field Moves.
Poké Assists are used during a capture attempt. Poké Assists have the same name as Pokémon types, except that there are no Normal, Dragon, or Steel Poké Assists, and the Poké Assist is most often the type of the Pokémon not represented by their group, if they have two types in the main series. The player's partner Pokémon (Plusle or Minun) is the only Pokémon that can use the Discharge Poké Assist.
List of Pokémon by Browser number
R-001 - R-051 Bulbasaur - Parasect
R-052 - R-100 Poliwag - Jigglypuff
R-101 - R-150 Rattata - Primeape
R-151 - R-200 Ekans - Absol
R-201 - R-213 Kangaskhan - Mew