>>55966898a tiger.
and palkia is a shark
their heads and faces hint to this, besides since giratina is a snake, a top tier predator, the other 2 should be such as well and the only ones that come to mind are these 2
If you think of the way giratina alternate transforms into snake it makes sense.
Palkia's arms are smaller than its legs, in fact they would transform into fins or disappear cause his wings look like fins, also the water type
Dialga is on 4 legs like a tiger, big claws, and looks like having saber teeth like raikou and entei
Plus the concept of shark makes sense with space and tiger with time. Those should be their origin forms
