now that's odd really odd you sure normally professor oak upgrades your pokedex to national pokedex and then professor Rowan gives you a gift which is pokeradar check in your key items at the bottom list
Meet professeur Rowan and PRofesseur OAK will there and he will give you a national dex
It is much easier if you first get your National Dex. Then talk to Rowan. He will give you a PokeRadar. Go to route 218 (it's by Canalave City) and use it in the tall grass. It does not work if you are on your bike. Mostly, you will just find Floatzel, Gastrodon, and Mr.Mime. But if the grass is shaking wildly, harder than the rest, go into it. Hopefully it will be a Ditto, lvl.28-29. Ditto can breed any Pokemon except legendaries. I hope this helps you get ditto!:]
You can go to professer Rowan's lab,but you have to beat the elite 4 first
Wild Trapinches can be found by using the PokeRadar on Route 228. Note: You must beat the game before Prof. Rowan gives you the PokeRadar. If by "captured female trapinch" you mean one that another trainer is using, Pokemon Ranger Krista has a level 54 Trapinch on Route 228, but I'm not sure if it is male or female. I sugget going there and checking.
You have got to see all Pokemon in the sinnoh dex, then talk to prof. rowan
you have to complete the national pokedex and see professor rowan. then professor oak will come in and give you the pokeradar.
the pokeradar searches out Pokemon in the tall grass so you don't run into any Pokemon. by the way you get the pokeradar from professor rowan after getting the national dex.
After you get the national dex, professor Rowan will give you the pokeradar.
you get it after u abtain the national pokedex off of pro rowan good luck
there is none, you just have to get the national dex then get the pokeradar off prof rowan.
Complete your Sinnoh Pokedex and talk to Professor Rowan. You get the National Dex and a Poke Radar.
After seeing all the Pokemon in the Sinnoh Dex go talk to Professor Rowan and Professor Oak will come and give you the pokeradar as well as the National Dex.
After getting pokedex compleeted go to sand gem talk to proffeser rowan he will give you national dex and pokeradar keep in mind have to beat poke leuage
You get it by going to Professor Rowan with your sinnoh pokedex completed and Professor Oak will rush in and give you the national pokedex and the Poke Radar.
After you finish the sinnoh dex, go to proffeser rowan. Professer oak will come and give you the national dex and the pokeradar
you need to beat the game once.go to the sandgem town.talk to professor rowan and he will give you pokeradar and national dex
To get a pokeradar in Pokemon diamond and pearl, you must see all of the sinnoh Pokemon in the game, then go to profeser rowan's lab and talk to him. he will give you a pokeradar and with it you can find Pokemon from other regions.