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follow the story of the game..veronica
Beat Stormy Sea
In the solar cave behind a locked door that you have to unlock with a key
You Can't
To get latios u need to unlock the dungeon need to get northen range (the dungeon)beat latias at north range then you unlock pitfall valley then go to the 25th floor then beat him then he joins you team
Beat Palkia
You have to beat Skarmory first, then go south of the Pokemon Square and either talk to the Makuhita or walk in the doorway.
Recruit Ho-oh from Mt. Faraway. Then, an event will trigger, opening Western Cave.
35 floor of wyvern cave, be sure to bring a key and then unlock it. Or find wondermail on google.
i believe you have to befriend with lugia
wonder mail
to evolve you have to get palkia and unlock marine resort