V.B.
Cool effects didn't work for us, the pull ups that had designs that would disapear when he peed helped.
One thing I heard for potty training a stubborn child is each monday morning ask them if they want to wear underwear and go in the potty, if they say no, put them in diapers and don't mention it again until the next monday. Let it be the child's choice.
For my son it had to be his choice. When I started potty training him it was a fight and caused major fits, finally I backed off and told him to let me know when he was ready. One day, he said he wanted to wear big boy underwear and since it was his choice he did great. (He was 3 1/2 when that happened and it nearly killed me to have him that old in diapers, but looking back it was the best way to go for him)