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I kinda hope they bring back all the legendaries like they did in ORAS, it really increased my playtime and made the whole thing feel epic in scope. There's spots for pretty much all of them, and they can be incorporated into the story this time too with Zygarde and the approaching Ultra Beast threat
Mewtwo - Aether Lab
Legendary Beasts/Ho-oh - Malie Garden
Lugia - Brooklet Hill
Latios/Latias - Tide Song Hotel, back area
Kyogre - Seaward Cave
Groudon - Blush Mountain
Rayquaza - Mt. Hokulani
Dialga, Palkia, Giratina - Ultra Space
Heatran - Wela Volcano
Musketeer trio - Poni Plains
Xerneas - Lush Jungle
Yveltal - Vast Poni Canyon
Kyurem - Mt. Lanakila
etc.