Is Reshiram really this size?

Anyway, the only thing you can't rely the Dex on is the size of serpents. If you take the image of Serperior's sprite and apply the size given on the Dex, you will have a super gigantic snake!

For serpents, the Dex seems to list length, not height (because listing the height of a serpent wouldn't make any sense whatsoever). A 10-foot long snake isn't that unthinkable.

Yes, I understand this. Although I never see them compare snakes to the trainer under the "Height Comparison" part of the game's Dex, I imagine that some like Arbok would be shown to be very huge compared to how big it's supposed to be if you use the Hoenn Dex (I used Hoenn's as an example because I don't know if Unova's have a "Height Comparison" feature). (Veekun's Dex shows that snakes are conspicuously large compared to the trainer, but then again, it's a fan site)

Thanks for reading.