Why is my pokeradar not working?

Question

Whenever I try to use it in pearl, it says I can't.

Comments

What is the exact message that it says?

Answer 1

There could be three problems:
you can't use the pokeradar when you are on a bike
it only works when you are on grass
you haven't recharged your pokeradar

Comments

I was on a bike, so I obviously feel stupid now.

Answer 2

Ah, I know the problem! you can't use it everywhere you want, it's only work when you are in tall grass! go to any tall grass (e.i tall grass on route 202), and then use Pokeradar! if it's work, the grass will shake which contain a wild pokemon...

Comments

This is probably the reason. Also you have to walk 50 or so steps between each time you use it.

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Yes, for recharge the pokeradar...