In classic Arminian theology, God confers universal prevenient grace. Everyone has sufficient grace to believe the Gospel. This doesn't ensure belief, but it enables belief:
According to classical Arminianism it is an operation of the Holy Spirit that frees the sinner’s will from bondage to sin and convicts, calls, illumines and enables the sinner to respond to the gospel call with repentance and faith (conversion).
So why do Arminians pray for the lost? If everyone already has sufficient grace to believe the Gospel, what is the Arminian asking God to do? Is he asking God to do something extra for that lost soul, over and above prevenient grace? But if God grants the request, isn't this unfair to all the other lost souls who never had that added advantage?
This is even more paradoxical in the case of outright Pelagians like Leighton Flowers.