EDIT: missed the train!
I see, you want smooth grid-based movement.
The 'move-to' custom plugin wold be ideal if you aren't interested in the Scirra arcade. Alternatively, you should look into the lerp() function. It can be a bit confusing at first but you will get nice smooth motion with deceleration.
To do lerp:
every tick:
set object x to lerp(self.x,destination.x,speed*dt)
set object y to lerp(self.y,destination.y,speed*dt)
Speed should be some value for the speed of the movement.