you have to go to union cave and pass through there then you will be able to get to the psychic guy in ruins of alph
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When you complete all the puzzles in the ruins of alph a guy will give you the unown report, when you catch all the unowns go to the house in the ruins of alph and give it to him, he will let you battle arceus LV.70.
it's on route 36. a guy by the ruins of alph, North entrance sign gives it to you.
Use rock smash on the rocks at the Ruins of Alph and you might find a fossil. You take it to the museum in Kanto and the guy will turn it into a Pokemon
1. you can smash rocks to find items and fossils. 2. catch all the unknown and this guy will give you some kind of an item. 3. im not sure of this one but i think the arceus event takes place there. hope this helps
its not in the johto or kanto region. bring arceus to the unknown ruins. then a guy will alow you to go to the ruins where u get a LV1 giratina dialga or palkia with repective orbs