493
Same as PokemonPearl, 151 is the max number of Pokemon in the starter pokedex.
104 before the national pokedex expansion
No, there is not a Pokedex after the National Pokedex in Pokemon Diamond Version.
diamond pokedex number 80 is Barboach
Riolu
484-500
Oddish is the 43rd Pokemon.
in the national pokedex it is mackoke. if it is in the sinnoh pokedex it is buneary.
Number 33 is Golem on the Sinnoh Pokedex.
arcanine
Yes.
In the Sinnoh Pokedex Number 114 is Mantine. In the National Pokedex its Kabutops.