iPhone wont charge on docking station but others will!

Either your lightning cable/dock connector is faulty (less likely) or your U2 IC (USB IC) is faulty (more likely). Hopefully it's the cable because changing the U2 IC is beyond the abilities of most DIYers.

You can buy a lightning dock connectorlike this one from iFixIt to test that problem. You don't need to follow the entire guide to replace the cable - just do steps 1-8 and then 16-17. That will give you access to 2 cables connected to the logic board. The bottom one is the battery. The top one is the dock connector. Pry the dock connector off as shown in step 33, then peel it back a bit and connect the new dock connector. Plug the new dock connector into one of the charging devices that's having the problem and see if it still happens. If not, the dock connector is the problem and you can follow that guide to replace it.

I'd be willing to wager that it won't fix it, though, as it's almost always caused by a failing USB IC. You can google Replace U2 IC 5c to see some info on how it's done but if you don't have the experience/equipment required for desoldering very small surface mount devices it's very difficult to do right. If you are still able to charge on some devices you might be better off just living with it for as long as you can. Be forewarned, though, that eventually the USB IC/U2 IC will fail completely and the phone will no longer charge.