How do you get Pokemon 102 in the Sinnoh pokedex?

Answer 1

to get Pokemon 102(i play diamond)so in the diamond game the Pokemon 102 is chatot.And if you want to obtain this go to route 222 and walk in the grassy patches,that's where you will find chatot.Hope this helped

go to the route 222 and 224 in the morningANSWER 2:the first answer is true but this way is easier so, if you cannot find a Chatot that way (i play diamond also, but this should be the same in pearl as well) i suggest you find a boy, who will trade you his chatot (nicknamed "charap") for a buizel.

He can be found inside a building in Eterna City (the same building as the name rater - next to the Pokemon mart)