Like most Pokmon cards, the value of Dialga ex depends on a few consistent factors: its rarity, the printing and finish (regular or foil), its physical condition, and the set it was printed in (Scarlet & Violet Promos)
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Id say theres a chance that a given deck in Standard uses this card more as a flurry enabler than a ramp spell
You just need to know where to look
The only other potential commander, Liberty Prime, Recharged , requires energy to both attack and block, and can only generate energy by sacrificing your other artifacts
With Hogaak gone, I think it is reasonable to diversify your graveyard hate instead of only playing the fastest options