you cannot fully utilize ddtar's potential without spikes. the key to using ddtar is to weaken your opponent with spikes, then simply set up and sweep.
with that being said, your team can do absolutely nothing with spikes on the field. sure, every one of your attacks hits spikers, but any decent player will find a way around it.
get a spiker, rapidspinner, and perhaps a status healer (forgot what the correct term was) because pokemon like weezing will have a blast putting status on you.