Legendary Locations

Articuno - Route 11 (hidden area, only accessible with Surf)

Zapdos - Route 9 (hidden area, only accessible with Surf)

Moltres - Jonk Cave

Mewtwo - Team Nose Laboratory

Mew - Route 6 (hidden area, only accessible after catching Articuno, Zapdos, Moltres, and Mewtwo, and winning the Bcoky Pokemon League)

Entei - Roaming around Bcoky Island 7 after defeating Red Sus

Raikou - Roaming around Bcoky Island 1 after defeating Red Sus

Suicune - Roaming around Bcoky Island 3 after defeating Red Sus

Ho-oh - Mt. Qzinnaya

Lugia - Mt. Qzinnaya

Celebi - Patterned Forest (hidden area, only accessible after catching Raikou, Entei, Suicune, Ho-oh, and Lugia, and winning the Bcoky Pokemon League)

Regirock - Jk Ruins, Brawl Chamber

Regice - Jk Ruins, Telepathy Chamber

Registeel - Jk Ruins, Night Chamber

Latias and Latios - Bcoky Victory Road

Kyogre - Route 23 (only accessible after winning the Bcoky Pokemon League)

Groudon - Jouch Cave (only accessible after winning the Bcoky Pokemon League)

Rayquaza - Roaming around Toh after catching Groudon and Kyogre

Jirachi - Gift Pokemon in the postgame for completing the Nose-Nosing Sidequest

Deoxys - Snowside Cave (hidden area, only accessible after catching the Regis, the Latis, Kyogre, Groudon, Rayquaza, and Jirachi)

Uxie - Route 11 (hidden area, only accessible in the postgame)

Mesprit - Route 13 (hidden area, only accessible in the postgame)

Azelf - Bcoky Route 12 (hidden area)

Dialga - Migi Pillar

Palkia - Migi Pillar

Regigigas - Jk Ruins (only accessible after catching Regirock, Regice, and Registeel)

Heatran - Jort Mountain

Giratina - Area under the Migi Pillar (only accessible after catching Dialga and Palkia)

Cresselia - Roaming around Toh after defeating the Bcoky Pokemon League

Darkrai - Roaming around Toh after defeating the Pokemon World Championship

Manaphy - Turning Forest (only accessible after defeating the Bcoky Pokemon League)

Phione - Breed Manaphy with Ditto

Shaymin - Toco Trail (hidden area, only accessible after catching the Lake Trio, Dialga, Palkia, Regigigas, Heatran, Giratina, Cresselia, Darkrai, and Manaphy)

Arceus - Hall of Origin (only accessible after completing the National Pokedex except for Arceus)