A Pokemon's strength all depends on its moveset and stats.
But I'd assumer that the Palkia would be better statistically, because of it's level.
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Well it really depends on what you are doing and what moves they have. At the moment I have a level 100 Palkia (Moves- Surf, Spatial Rend, Aura Sphere, Earth Power) that is my favourite and the better due to the fact Dialga's level is 88 and the moves i taught are mostly crap (moves- roar of time, earth power, cut, strength). They both do a good job of smashing other Pokemon. I'll get dialga up to level 100 (teach it some good moves) and vs Palkia. I'll get back to you on this one. Yeah I did this and Palkia SMASHED Dialga. But I think it still doesn't matter because you will rarely be versing hard Pokemon.
a level 48 lv giratina a level 100 rayquayza level 70 palkia and dialga a level 80 groudon and kyogre
I think that palkia is the best because i bought Pokemon pearl. Palkia's Spacial Rend is awesome! My palkai knows: -Spacial Rend 100 -Draco Meteor120 -Surf 95 -Aura Sphere 90 never misses Giratina's shadow force is cool and Dialga's Roar of Time is strong, but i like PALKIA- DRAGON/WATER type Well I'm pretty sure Palkia is the weaker than Dialga because in the move Dialga breaks Palkia's 2crystals on his arms. Dialga and Giratina I'm not sure.... that's because palkia stud strong and didnt use protect
No one really knows, it's nature can be different with each game that's being played. Palkia's faster, but Dialga can learn trick room. Regarding trick room, Palkia can learn earth power as a comeback, which has 90 power and 100 accuracy and is super effective against Dialga, but Dialga knows roar of time, which has 150 power and 90 accuracy. I've tried this before and used it on a Palkia, Giratina, and Arceus. For Palkia, it sucked against roar of time. It was a one hit KO.
It depends on what its Nature, IVs, and EVs are. A level 100 Dialga can have a minimum of 310 HP and maximum of 404 HP.