Pocket rocket charger says its fully charged, but its really not

Follow the wires from the battery all the way to the motor. You should find a large amp sized fuse or a resettable circuit breaker in line. Razor PR200 24V Electric Motorbike Parts

Did the socket the charger was plugged into actually have 120vac in the socket?
Or are you sure the charger is actually working? Is there a short so that the battery is draining as fast or faster than the charger is providing a charge?

No. The switch should be off before connecting the charger.

You can download a manual from Razor here...
http://www.razor.com/customer-care/owners-manuals/

You use the supplied charger, or if you got it used without a charger, you can buy one here: Replacement Razor Pocket Rocket PR200 Scooter Battery Charger Adapter... After that, you plug the charger into the wall securely, and pull down on the round cover next to the motorcycles power button until it opens. Then plug the other end of the charger into the motorcycle.

A green light means the battery is charged.

The battery is probably bad. If a battery is fully discharged it can damage one of the cells in the battery. If you can replace the bad cell then it should charge correctly. Many of these batteries are made to be hard to open up and are hard to repair when they are opened. My best solution is to replace the battery and if that doesn't help then the charger is bad. When the charger is replaced then if both batteries are good then you will have a spare. I hope this helps.

This is a battery problem. It needs replacement. There is likely a dead cell. Usually this happens from improper charge or not fully discharging.

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it wont charge because the batteries need to be replaced.

You probably need a new battery. It is not uncommon for them to just be dead one day .  Check the razr website for replacement parts.  Thanks!

green means full charge.