Pokémon FireRed and LeafGreen/Completing the Pokédex

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To truly beat the game you will need to complete the National Pokédex. Since you only need to have 60 different Pokémon from the regional Pokédex which includes evolving your caught Pokémon, it's just easier to complete the National Pokédex as doing so will also complete the regional Pokédex. Once you have 60 Pokémon and you have beaten the Elite Four then Professor Oak will upgrade your regional Pokédex to the National Pokédex.

Difference between the regional and National Pokédexes

The regional Pokédex is the exact same as the Pokédex from the Pokémon Red and Blue games. The National Pokédex includes all the Pokémon from the previous Pokédex plus all the Pokémon from Pokémon Gold and Silver and from Pokémon Ruby and Sapphire making it a total of 386 Pokémon.

Pokédex Certificates

To obtain the regional Pokédex Certificate, you will either need both copies of FireRed and LeafGreen as Oddish, Psyduck, Growlithe, Shellder, and Scyther are exclusive to FireRed and Slowpoke, Vulpix, Bellsprout, Staryu, Magmar, and Pinsir are exclusive to LeafGreen and you need to trade them to the other game. You need to catch all 150 Kanto Pokémon excluding Mew.

Even though there are 386 Pokémon registered in the National Pokédex, you only need to catch 380 of them which excludes Mew, Ho-Oh, Lugia, Jirachi, Deoxys, and Celebi to obtain the National Pokédex Certificate. To do this you need a Emerald or Pokémon XD: Gale of Darkness game to obtain the Johto starters and trade them to your FireRed/LeafGreen game.

FireRed and LeafGreen Pokémon

This is the list of Pokémon that you need the other version of the game to trade for them

Regional Pokédex

Pokémon	Game
Ekans	FireRed
Sandshrew	LeafGreen
Vulpix	LeafGreen
Oddish	FireRed
Psyduck	FireRed
Growlithe	FireRed
Bellsprout	LeafGreen
Slowpoke	LeafGreen
Shellder	FireRed
Staryu	LeafGreen
Scyther	FireRed
Electabuzz	FireRed
Magmar	LeafGreen
Pinsir	LeafGreen

In-game trades

This is the list of Pokémon you can only obtain via trading with a NPC in the game

Obtain	Location
Farfetch'd	Vermilion City
Lickitung	Route 18
Mr. Mime	Route 2
Jynx	Cerulean City

Gift Pokémon

Obtain	Location
Hitmonlee	The Fighting Dojo
Hitmonchan	The Fighting Dojo
Eevee	Celadon Mansion

Fossil Pokémon

You can only obtain either a Dome Fossil or Helix Fossil to get a Kabuto or an Omanyte respectively. You will need the other version to trade for the one you didn't obtain.

To get Aerodactyl you will need to go to the back entrance of the Pewter Museum and talk to the scientist and obtain the Old Amber which you bring to the Pokémon Lab on Cinnabar Island.

Breeding for evolutions

1) Since you can only obtain either Hitmonchan or Hitmonlee at the Fighting Dojo. To obtain the one along with Hitmontop, you will need to breed the one you chose with a Ditto to get a Tyrogue then raise it to level 20 with the follow stats:

Hitmonlee: Attack higher than Defense
Hitmonchan: Defense higher than Attack
Hitmontop: Attack equal to Defense

2) You can also breed an Eevee 4 times so you can obtain its 5 evolutions, Flareon(Fire Stone), Jolteon(Thunderstone), Vaporeon(Water Stone), Espeon(level up during the day with high friendship), and Umbreon(level up during the night with high friendship)

Legendary Pokémon

You will only be able to catch these Pokémon once so if you defeat them then you won't see them again. Save the game before fighting them.

Pokémon	Location
Articuno	Seafoam Islands
Articuno	Power Plant
Moltres	Mt. Ember
Mewtwo	Cerulean Cave

Legendary Beasts

You can only obtain one Legendary Beast per game and which one appears depends on your starter Pokémon. You need to obtain all 3 to get the National Pokédex Certificate so you have to get the other 2 via trade.

For more information on catching the Legendary Beasts you can visit Capturing a Legendary Beast

Pokémon	Starter Pokémon
Raikou	Squirtle
Entei	Bulbasaur
Suicune	Charmander