face it, there are very few serious ubers players, I get shit like that almost every battle.
I've seen that lv 1 aron thing, for example, ect.
My personal favorite is the blast burn charizard partnered up with Kyogre that noobs use. What a great offensive core.
Anyway, I can't really see Dialga passing up Kyogre, Kyogre has the Pokemon equivalent of a nuke in the form of specs water spout (and to a lesser extent Scarf).
Dialga's good and all, but Kyogre is much more of an offensive force than it. Although the support set seems to be pretty good though