Ok look guys, as has been mentioned several times, the Seviper, Milotic, Wailord, etc. in that Pokedex are not that height. That is their length from head to tail, it's just that the Pokedex doesn't differentiate for some odd reason.

That said, I think it's cool that instead of the generic trainer from the old Pokedex, they have their size in comparison to a pic of Ash in his new Hoenn clothes.