Control individual bulbs in a 6-can dimmer series
When the smart bulbs say "dimmable", what they mean is you can dim them via the smart control system built into the bulb.  They do not mean you can put them downline of a dimmer.  They especially do not mean you can do both at once! 

This is something we see a lot of, people getting a bunch of random lighting-control parts and expecting it all to just "automagically" work together.   Nope.  One control system at a time.

If it's not the only light in the room, I would advise bypassing the old dimmer entirely and just hardwire always-hot to the bulb sockets. Otherwise, yank it out and replace it with a plain switch, but expect weirdness if you try to control the lights both with the WeMo and the plain switch.