Location: Seafoam Island

Method:
The stunning Ice/Flying legendary bird Pokemon, Articuno appears at the bottom of Seafoam Islands after a rigorous rock-moving puzzle involving Strength and Surf.

Articuno Level 50

OT: Yours ID: Yours Ability: Pressure Hold Item: None

??? Nature. Date of Receiving Seafoam Island. Caught at Lv. 50

Mist Agility Mind Reader Ice Beam

Location: Power Plant

Method:
The shockingly powerful Electric/Flying legendary bird Zapdos appears at the end of the Power Plant near the exit.

Zapdos Level 50

OT: Yours ID: Yours Ability: Pressure Hold Item: None

??? Nature. Date of Receiving Power Plant. Caught at Lv. 50

Thunder Wave Agility Detect Drill Peck

Location: Mt. Ember

Method:
Moltres, the Fire/Flying legendary bird, is the only Pokemon to leave its original home from Red and Blue. This time you can find it residing at the volcanic Mt. Ember on One Island, after a Strength boulder puzzle.

Moltres Level 50

OT: Yours ID: Yours Ability: Pressure Hold Item: None

??? Nature. Date of Receiving Mt. Ember. Caught at Lv. 50

Fire Spin Agility Endure Flamethrower

Location: Cerulean Cave

Method:
The strongest Pokemon, Mewtwo, makes its home at the end of the treacherous Cerulean Cave. This unknown dungeon cannot be accessed until after you've received the National Dex and requires Surf, Rock Smash, and Strength to navigate. Get its HP down carefully and avoid burning, confusing, or poisoning it so you don't knock it out accidentally. Sleep and paralysis work well.

Mewtwo Level 70

OT: Yours ID: Yours Ability: Pressure Hold Item: None

??? Nature. Date of Receiving Cerulean Cave. Caught at Lv. 70

Swift Recover Safeguard Psychic

Location: Navel Rock

Method:
The legendary birds of the Johto region take residence in the eighth Sevii Island, Navel Rock. To get there, you need the MysticTicket. Inside the island there are two paths; the one on the left takes you up a long flight of stairs to meet Ho-oh at the summit, whereas the one on the right takes you down to the heart of the island underwater to meet Lugia. Be prepared for a tough battle - both are at Level 70.

Lugia Level 70

OT: Yours ID: Yours Ability: Pressure Hold Item: None

??? Nature. Date of Receiving Navel Rock. Caught at Lv. 70

Recover Hydro Pump Rain Dance Swift

Location: Navel Rock

Method:
The legendary birds of the Johto region take residence in the eighth Sevii Island, Navel Rock. To get there, you need the MysticTicket. Inside the island there are two paths; the one on the left takes you up a long flight of stairs to meet Ho-oh at the summit, whereas the one on the right takes you down to the heart of the island underwater to meet Lugia. Be prepared for a tough battle - both are at Level 70. Once you capture Ho-oh, don't forget the Sacred Ash that lay hidden where it was standing.

Ho-Oh Level 70

OT: Yours ID: Yours Ability: Pressure Hold Item: None

??? Nature. Date of Receiving Navel Rock. Caught at Lv. 70

Recover Fire Blast Sunny Day Swift

Location: Birth Island

Method:
For the first time ever you can catch the final Pokemon of the Hoenn Pokedex, Deoxys, provided you've got the AuroraTicket item. Deoxys is fittingly found on the last Sevii Island, Birth Island - but only after you complete a rather unique puzzle. This puzzle involves chasing a black triangle around the island and talking to it until it becomes red hot, after which Deoxys will emerge and attack. Perhaps unusually, Deoxys is the lowest leveled Legendary Pokemon at just Level 30, so be careful not to knock it out.

After you catch Deoxys it will revert to either its Attack Forme in FireRed or its Defense Forme in LeafGreen. These cannot be changed without trading, and only then as long as the Pokemon is in the game - however, stats will still be calculated accordingly for link battles. That is to say, for example, that a Deoxys on Emerald would have its Speed Forme stats when fighting against FireRed (and vice versa).

Deoxys Level 30

OT: Yours ID: Yours Ability: Pressure Hold Item: None

??? Nature. Date of Receiving Birth Island. Caught at Lv. 30

Taunt Pursuit Psychic Superpower

Deoxys Level 30

OT: Yours ID: Yours Ability: Pressure Hold Item: None

??? Nature. Date of Receiving Birth Island. Caught at Lv. 30

Knock Off Spikes Psychic Snatch

Location: Kanto

Method:
Making their debut in the Kanto region are the legendary dog trio of Johto, who once again take to the grasses of the countryside as roaming Pokemon. You will only encounter one per game and its contingent upon which starter Pokemon you picked; that is, the legendary with the type advantage will appear - Entei for Bulbasaur, Suicune for Charmander, Raikou for Squirtle. You must also have cleared Team Rocket out of the Sevii Islands to trigger their appearence. As with all roaming Pokemon their location is totally random the first time, and they will attempt to escape on the first turn of battle. This means you must use a trapping move such as Block to be able to fight them. A word of caution, though - due to a glitch, Entei and Raikou (but not Suicune) will sometimes use Roar if trapped and can never be seen again. For this reason it may be best to save your Master Ball to use on these incredibly difficult Pokemon.

Raikou Level 50

OT: Yours ID: Yours Ability: Pressure Hold Item: None

??? Nature. Date of Receiving Location of Capture. Caught at Lv. 50

Thundershock Roar Quick Attack Spark

Entei Level 50

OT: Yours ID: Yours Ability: Pressure Hold Item: None

??? Nature. Date of Receiving Location of Capture. Caught at Lv. 50

Ember Roar Fire Spin Stomp

Suicune Level 50

OT: Yours ID: Yours Ability: Pressure Hold Item: None

??? Nature. Date of Receiving Location of Capture. Caught at Lv. 50

Bubblebeam Rain Dance Gust Aurora Beam