It is Torterra, and you get it's data by seeing it in Dawn's, your rival's, or your own party.
barboach
burmy
Lumineon
it is dialga
Barbroach is number 80
In Diamond/Pearl, the Sinnoh Pokedex #102 is Chatot.
In Diamond & Pearl's version of the Sinnoh Dex, Pokémon #149 is Dialga.
Number 53 on the Sinnoh Pokédex is Combee, you can find it by using Honey on trees.
Unown.
Unown is pokémon number 114 in the Sinnoh (Pearl/Diamond/Platinum) pokédex.
You have to see all the Pokemon in the Sinnoh Pokedex.
In the sinnoh pokedex, there is Infernape. In the national pokedex there is Charizard. I hope that helps!!!!!!