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.
Alola League
Trial Captains
| Verdant Cave | 
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Ilima
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| Brooklet Hill | 
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Lana
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| Wela Volcano Park | 
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Kiawe
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| Lush Jungle | 
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Mallow
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| Hokulani Observatory | 
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Sophocles
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| Thrifty Megamart | 
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Acerola
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| Poni Gauntlet | 
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Mina
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Island Kahunas
| Iki Town | 
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Hala
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| Konikoni City | 
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Olivia
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| Malie City | 
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Nanu
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| Vast Poni Canyon | 
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Hapu
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Unlocked with Alola Ribbon
 #785 Tapu Koko |
 #787 Tapu Bulu |
 #788 Tapu Fini |
 #786 Tapu Lele |
 #793 Nihilego |
 #794 Buzzwole |
 #795 Pheromosa |
 #796 Xurkitree |
 #797 Celesteela |
 #798 Kartana |
 #799 Guzzlord |
 #800 Necrozma |
 #803 Poipole |
 #805 Stakataka |
 #806 Blacephalon |
 #808 Meltan |
Other Legendary Ribbons
| Legendary Ribbons |
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| Kanto · Johto · Hoenn · Sinnoh · Unova · Kalos · Alola · Galar · Paldea · Vortex |