After you defeat the all Gym Leaders,Elite 4 and Champs in Kanto Gym,You will unlock legendaries
- Articuno
- Zapdos
- Moltres
- Mewtwo
- Mew
Gym Leaders
Brock
- Gives you the Boulder Badge
- Pokemons-Level 12 Graveler and Level 14 Onix
Misty
- Gives you the Cascade Badge
- Pokemons-Level 18 Staryu and Level 21 Starmie
Lt. Surge
- Gives you the Thunder Badge
- Pokemons-Lvl 21 Voltorb,Lvl 18 Pikachu,Lvl 24 Raichu
Erika
- Gives you the Rainbow Badge
- Pokemons-Lvl 29 Victreebel,Lvl 24 Tangela,Lvl 29 Vileplume
Janine
- Gives you the Fuchsia Badge
- Pokemons-Lvl 42 Crobat,Lvl 39 Weezing,2 Lvl 42 Ariados and Lvl 47 Venomoth
Sabrina
- Gives you the Saffrom Badge
- Pokemons-Level 38 Kadabra,Lvl 37 Mr Mime,Lvl 38 Venomoth,Lvl 43 Alakazam
Blaine
- Gives you the Volcano Badge
- Pokemons-Lvl 42 Growlithe,Lvl 40 Ponyta,Lvl 42 Rapidash,Lvl 47 Arcanine
Giovanni
- Gives you the Earth Badge
- Pokemons-Lvl 45 Rhyhorn,Lvl 42 Dugtrio,Lvl 44 Nidoqueen,Lvl 45 Nidoking,Lvl 50 Rhyhorn
Elite 4
Lorelei
- Pokemons-Lvl 52 Dewgong,Lvl 51 Cloyster,Lvl 52 Slowbro,Lvl 54 Jynx,Lvl 54 Laparas
Bruno
- Pokemons-Lvl 51 Onix,Lvl 53 Hitmonchan,Lvl 53 Hitmonlee,Lvl 54 Onix,Lvl 56 Machamp
Agatha
- Pokemons-Lvl 54 Gengar,Lvl 54 Golbat,Lvl 53 Haunter,Lvl 56 Arbok,Lvl 58 Gengar
Lance
- Pokemons-Lvl 56 Gyarados,2 Lvl 54 Dragonairs,Lvl 58 Aerodactyl and Lvl 60 Dragonite
Champ
Blue
- Pokemons-Lvl 59 Pidgeot,Lvl 57 Alakazam,Lvl 59 Rhydon,Lvl 59 Arcanine,Lvl 61 Gyarados and Lvl 63 Blastoise