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How Many Pokémon Can You Get with Only Pokémon FireRed?

FireRed has two separate Pokédexes to complete: the Kanto Pokédex and the National Pokédex. All Pokémon from the Kanto Pokédex, except for Mew (which was only obtainable via long-defunct events), are available between FireRed and LeafGreen. Only a select few Pokémon from the National Pokédex are available in FireRed. This page will cover both the Kanto and National Pokédexes.

The number of Kanto Pokédex Pokémon that are available without trading is 125. Three of these are only available with the Breeding mechanic, which only becomes available after defeating the Elite Four. The list of Pokémon you cannot get without trading, which equals 26 species, is as follows:

Two Starters (6) - 6 total
As you can only select one starter Pokémon, the other two starters, and their evolutions, are unavailable; this totals 6 Pokémon.
Trade Evolutions (4) - 10 total
Golem, Machamp, Alakazam, and Gengar evolve by trade. Without the ability to trade, they are unobtainable.
One Fossil Pokémon (2) - 12 total
As you can only obtain one Fossil in Mt. Moon, you miss out on the other Fossil Pokémon (Omanyte or Kabuto) and its evolution.
Version Exclusives (13) - 25 total
The following Pokémon cannot be obtained without the use of glitches or trading: Sandshrew, Sandslash, Bellsprout, Weepinbell, Victreebel, Vulpix, Ninetales, Slowpoke, Slowbro, Staryu, Starmie, Pinsir, and Magmar.
Mythical/Event (1) - 26 total
Outside of glitches, Mew was only obtainable via events that are no longer active.

The total number of Pokémon available without trading is 170. The list of available National Pokédex Pokémon is as follows:
Blissey, Crobat, Slugma, Magcargo, Dunsparce, Tyrogue, Hitmontop, Pichu, Cleffa, Igglybuff, Smoochum, Elekid, Wooper, Quagsire, Swinub, Piloswine, Delibird, Sentret, Furret, Hoppip, Skiploom, Jumpluff, Qwilfish, Togepi, Togetic, Murkrow, Natu, Xatu, Yanma, Wobbuffet, Wynaut, Bellossom, Heracross, Spinarak, Ariados, Ledyba, Ledian, Phanpy, Donphan, Larvitar, Pupitar, Tyranitar, Skarmory, Unown, and one of Raikou, Entei, or Suicune

If you are playing the Switch rerelease of FireRed, you will have access to Ho-Oh, Lugia, and Deoxys with the Mysticticket and Auroraticket items. If you can get these Pokémon, the total is instead 173.

The Professor Oak challenge guide for FireRed, which covers the National Pokédex, can be found here, although I've made a shorter list of encounters below in case anything happens to the external guide.

Professor Oak Challenge Notes

Pre-Badge 1 (Brock) - 19 Total Pokémon

Badge 1 through Badge 2 (Misty) - 51 Total Pokémon

Badge 2 through Badge 3 (Koga) - 103 Total Pokémon

Badge 3 through Badge 4 (Blaine) - 117 Total Pokémon

Badges 4 through 5 (Erika) - 119 Total Pokémon

Badges 5 through Elite Four - 121 Total Pokémon

Post-Elite Four - 125 Total Pokémon

Post-Elite Four - National Pokédex - 170 Total Pokémon

All National Pokédex Pokémon are only available after defeating the Elite Four.

If you are able able to obtain Ho-Oh, Lugia, and Deoxys, the total for this section is 173.