You need to complete your Sinnoh pokedex. Then talk to prof. Rowan, after your pokedex has been upgraded, Rowan will give it to you.
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Yes you can get the Poke Radar
You cannot get the Poke Radar in Pokemon Black.
The poke radar doesn't exist in firered.
No, you can't use the Poke Radar on water. It's only usable in grass.
no u dont need a poke radar u can find him on route 206