To obtain Ho-Oh on Pokémon Quetzal (v0.8.1), you must first complete the Pokémon League and head to the Battle Frontier. At the shop next to the Pokémon Center, purchase the Mystic Ticket. Then, fly to Lilycove City, use the ticket at the harbor, and travel to Navel Rock.
Once there, go deep into the cave and choose the left path—the one that goes up the stairs. Climb up several floors until you reach the chamber where Ho-Oh will be waiting at level 70.
You can see how to get it in this video.
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