In order to unlock Legendary Pokémon encounters, a player must obtain ribbons by defeating gym leaders. Each ribbon represents a Pokémon region and unlocks its respective legendaries. All gym leaders in a region need to be defeated. You can track your progress from your profile by checking your obtained badges. In the past, elite 4 members, champions, battle frontier brains, and battle maison members had to be completed for all legendary Pokémon to become obtainable but is no longer the case after a v4 update.
Kalos League
Gym Leaders
| Santalune City Gym | 
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Viola
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| Cyllage City Gym | 
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Grant
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| Shalour City Gym | 
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Korrina
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| Coumarine City Gym | 
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Ramos
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| Lumiose City Gym | 
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Clemont
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| Laverre City Gym | 
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Valerie
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| Anistar City Gym | 
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Olympia
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| Snowbelle City Gym | 
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Wulfric
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Unlocked with Kalos Ribbon
 #716A Xerneas (Active) |
 #717 Yveltal |
 #718 Zygarde |
 #719 Diancie |
Other Legendary Ribbons
| Legendary Ribbons |
|---|
| Kanto · Johto · Hoenn · Sinnoh · Unova · Kalos · Alola · Galar · Paldea · Vortex |