I can't seem to get a moving wall to stop moving when it hits a position?

Trying to make a moving wall with bodyvelocity that stops at a certain position

x = game.workspace.Wall

if x.Position==Vector3.new==245.5, 134, 0 then x.BodyVelocity.Velocity=Vector3.new==0 end

You have some mistakes here, quite major ones. First off, Vector3.new is a built-in function, and because it's a function it needs parenthesis instead of equals.

Your code but fixed:

local x = game.Workspace.Wall -- making it local will increase performance

if x.Position == Vector3.new(245.5, 134, 0) then
	x.BodyVelocity.Velocity = Vector3.new(0, 0, 0)
end