RE: Pokémon Theories
I think the giants it was refering to are Palkia, Dialga and Giratina, because they are Sinnoh's trio, and Arceus is the trio master. Since Arceus was the only thing before the universe, he created Dialga, Palkia, and Giratina. that solves your problems.
Xous said:Most of the theories I've seen have already been posted, so I'll share something that I've been thinking over since Diamond / Pearl.
When the player picks up a Plate in the games, each Plate has a message written on the back. One of these messages is "The power of defeated giants infuses this Plate." Nothing I've seen in the games / movies / anything even hints at what "giants" they're referring to, or why they had to be defeated for their powers to infuse the Plates. Why would these Plates, which can be used to power up any Pokémon's moves of a certain Type (and of course change Arceus's Type entirely), exist with the power of defeated giants within them? Were these giants God-like Pokémon that ruled over each Type?
To make matters more confusing, another message from a Plate (and Arceus's Dex entries) states "The Original One breathed alone before the universe came." If Arceus truly existed alone before even the universe, did it not originally have the ability to use the Plates? Did it at some point have to defeat these "giants" to obtain the power of using the Plates, or did some kind of ancient civilization defeat the giants to create the Plates for Arceus? Were the Plates always within Arceus's control, but possibly weaker (and defeating the giants strengthened them)?
It's a tiny detail that has had next to zero clarification officially (that I know of), so it's entirely possible these "giants" will be future Legendary Pokémon for future games.
I think the giants it was refering to are Palkia, Dialga and Giratina, because they are Sinnoh's trio, and Arceus is the trio master. Since Arceus was the only thing before the universe, he created Dialga, Palkia, and Giratina. that solves your problems.