No, you cannot find it. The Arceus you saw in that video is posibility event Arceus (either in Pearl/Diamond/Platinum with Azure Flute, obtain from the past event (and hacking) or past event Arceus for HeartGold and SoulSilver (can obtain from hacking too)). If you bring the event Arceus in HeartGold or SoulSilver to Ruins of Alph, you will get access to Sinjoh Ruins, where you can get Lv. 1 Dialga (Adamant Orb)/Palkia (Lustrous Orb)/Giratina (Griseous Orb).
In other word, you can get Two Legendary Pokemon (Dialga, Palkia and Giratina (you can only get one for either species), if you had Azure Flute Event Arceus and HeartGold and SoulSilver Event Arceus.
Hope this answer helping you.
Source: Experience and Bulbapedia