Its carnivine you get him in the great marsh
In the normal pokedex #131 is Carnivine. the website has the sinnoh pokedex the one you start with. http://www.pokemonplatinum.net/v2/pokedex/ Hope this helped! :)
146 = Moltres 131 = Lapras
Lapras is #131 in the national pokedex, and it is a Water-Ice type Pokemon.
Number 131 is carnivine. This can be found in many spots. I found it in the safari area in pastoria city.
Carnivine
Chinchou is number 170 in the National Pokedex, number 174 in the New Pokedex, number 176 in the Johto Pokedex, #181 in the Hoenn Pokedex, and number 147 in the Coastal Kalos Pokedex.
131 is an odd number.
Sceptile is number 3 in the Hoenn Pokedex and number 254 in the National Pokedex.
Rayquaza is Pokedex number 384.
ON sinnoh pokedex is number 15 Kricketot on Natiol pokedex number 15 is: Beedrill
he is number 153 in the sinnoh pokedex
Aggron is number 306 in the pokedex.