From Bulbapedia, the community-driven Pokémon encyclopedia.
This is a list of Pokémon obtainable from events found in the Generation III Pokémon games. These specific instances of Pokémon can only be obtained once per game; however, some may also be obtained in other ways as well.
Professor Birch gets attacked by a wild PoochyenaRS or ZigzagoonE and the player has to use either Treecko, Torchic, or Mudkip to save him.
The old woman by the sand baths in Lavaridge Town will give the player a Wynaut Egg.
The staff of the Weather Institute will give the player a Castform for saving the facility from Team MagmaR or Team AquaSE.
There are eight set encounters with Kecleon accessible via the Devon Scope throughout Route 119 and Route 120.
In Ruby and Sapphire, the player may choose between the Root and Claw Fossils on Route 111, while the other fossil will sink forever. In Emerald, the player may choose between the two fossils in the Mirage Tower, while the other fossil will be available to him/her after defeating the Elite Four in the Desert Underpass. The fossils can be revived at the Devon Corporation headquarters in Rustboro City.
After defeating the Elite Four, Steven will leave a Beldum at his cottage in Mossdeep City.
Rayquaza is found on the roof of the Sky Pillar, which reveals itself after the player defeats the Elite Four. In Emerald, Rayquaza is found on the roof of the Sky Pillar, where it sleeps after quelling the fight between Kyogre and Groudon. It can be challenged as soon as the events in Sootopolis City are resolved.
The caves where the titans can be caught can be accessed only after visiting the rear of the Sealed Chamber with a Relicanth in the lead spot of the party and a Wailord in the last spot. In Emerald, the player must have a Wailord in the lead spot of the party and a Relicanth in the last spot.
To solve the puzzle leading to Regirock in the Desert Ruins, the player must read the Braille inscription in the rear of the lobby, then go two steps right, then two steps down, and then use Strength. In Emerald, the player must read the Braille inscription in the rear of the lobby, then go two steps left, then two steps down, and then use Rock Smash.
To solve the puzzle leading to Regice in the Island Cave, the player must read the Braille inscription in the rear of the lobby, then wait two minutes without moving. In Emerald, the player must read the Braille inscription in the rear of the lobby, then must make a counterclockwise lap of the chamber, sticking close to the walls.
To solve the puzzle leading to Registeel in the Ancient Tomb, the player must read the Braille inscription in the rear of the lobby, then attempt to use Fly in the center of the room. In Emerald, the player must read the Braille inscription in the rear of the lobby, then attempt to use Flash in the center of the room.
In Ruby, Latias can be found on Southern Island, which can be accessed with the Eon Ticket. In Sapphire, Latias will roam Hoenn after the player learns of her on a news broadcast after beating the Elite Four. In Emerald, after beating the Elite Four, the player will see a news broadcast about a Pokémon roaming Hoenn. The player's Mom will then ask what color the Pokémon was. If the player answers "Red", Latias will be the Roaming Pokémon. If the player answers "Blue", Latias will be found on Southern Island.
In Sapphire, Latios can be found on Southern Island, which can be accessed with the Eon Ticket. In Ruby, Latios will roam Hoenn after the player learns of him on a news broadcast after beating the Elite Four. In Emerald, after beating the Elite Four, the player will see a news broadcast about a Pokémon roaming Hoenn. The player's Mom will then ask what color the Pokémon was. If the player answers "Blue", Latios will be the Roaming Pokémon. If the player answers "Red", Latios will be found on Southern Island.
Groudon is exclusive to Ruby. It is found during the climax of the game, in the Cave of Origin.
Kyogre is exclusive to Sapphire. It is found during the climax of the game, in the Cave of Origin.
Professor Birch will give the player either Chikorita, Cyndaquil, or Totodile after completing the regional Pokédex.
Sudowoodo is located in the southeast section of the Battle Frontier. Much like in Generation II games, NPCs will talk about it as a tree. However, when the player uses the Wailmer Pail on it, it will spring to life.
After defeating the Elite Four, a researcher inside the Weather Institute will occasionally tell the player about harsh sunlight on either Route 114, 115, 116, or 118. At the specified route, he or she will discover a newly formed cave - the Terra Cave, where Groudon has been resting since its battle with Kyogre.
After defeating the Elite Four, a researcher inside the Weather Institute will occasionally tell the player about torrential rainfall on either Route 105, 125, 127, or 129. If the player Dives in a newly created trench of deep water, he or she will discover the Marine Cave, where Kyogre has been resting since its battle with Groudon.
If the player has an Old Sea Map, he or she can take a ferry to Faraway Island. Here, the player can catch Mew. The Old Sea Map was only ever distributed in Japan, so the event remains Japanese-exclusive.
Professor Oak gives the player a choice of Bulbasaur, Charmander, or Squirtle as starter Pokémon.
A salesman in Route 4's Pokémon Center will offer a Magikarp to the player for 500.
A Poké Ball containing Eevee can be found on the roof floor of Celadon Mansion in Celadon City.
There are two set encounters with Snorlax accessible via the Poké Flute; one on Route 12 and one on Route 16. The player must capture or defeat at least one of them to proceed to Fuchsia City.
Hitmonlee and Hitmonchan
Koichi, the master of the Fighting Dojo in Saffron City, will reward the player with their choice of either Hitmonlee or Hitmonchan after defeating him.
After defeating Blue during Team Rocket's invasion of Silph Co., an onlooking Silph employee will entrust the player with a Lapras.
At Berry Forest, a wild Hypno was found attacking Lostelle. The player must either catch or defeat it in order for Lostelle to go home.
Omanyte and Kabuto
The Helix and Dome Fossils are found at the end of Mt. Moon, but the player may only choose one to keep. The player may revive the Fossil in the Pokémon Lab on Cinnabar Island.
The Old Amber is located in the secret part of the Pewter Museum of Science, which can only be accessed with HM01 (Cut). The player may revive the Fossil in the Pokémon Lab on Cinnabar Island.
A Gentleman at the end of the Water Labyrinth will give the player a Togepi Egg if there is a party slot available. If the player shows Togepi to the Gentleman when its friendship is high, but before it evolves, he will mention Daisy, helping complete her entry in the Fame Checker.
Articuno is found within the depths of the Seafoam Islands.
Zapdos is found inside the abandoned Power Plant.
Moltres, as opposed to being found inside Victory Road in Generation I, is found on the peak of Mt. Ember of the Sevii Islands.
Mewtwo is found within the depths of Cerulean Cave, accessible only to powerful Trainers who have defeated the Elite Four.
After the player defeats Team Rocket in the Rocket Warehouse on Five Island, one of the legendary beasts of Johto will start roaming Kanto. The beast that appears varies based on what Pokémon the player chose as his or her starter. In the case of Raikou and Entei, the player should be wary of the Roaming Roar bug; if the beast uses Roar to flee from battle, it will permanently disappear.
If the player chose Bulbasaur:
If the player chose Charmander:
If the player chose Squirtle:
Lugia and Ho-Oh
If the player has a MysticTicket, he or she can take a ferry to Navel Rock. Here, the player can catch Lugia in its depths, and Ho-Oh at its peak.
If the player has an AuroraTicket, he or she can take a ferry to Birth Island. Deoxys is always in its Attack Forme in FireRed, Defense Forme in LeafGreen and Speed Forme in Emerald.
Espeon and Umbreon are in the player's possession at the beginning of the game.
Plusle is given to the player by Duking after rescuing it.
This Eevee is in the player's possession from the beginning of the game.
Johto starter Pokémon
After completing Mt. Battle by defeating 100 opponents with the same party, the player can have one of the following Johto starters. The player is able to redo the challenge all over again and obtain the remaining Pokémon that were not chosen.