How to move a model using TweenService?

If you want to move a model with TweenService, you can create a dummy CFrameValue, tween its value, and call SetPrimaryPartCFrame() on the model in the Changed event of the value.

Example:

local cfv = Instance.new("CFrameValue", model)
cfv.Value = model.PrimaryPart.CFrame

local function Tween(obj, t, properties) --my tween function, feel free to change it
    local TweenService = game:GetService("TweenService")
    local ti = TweenInfo.new(t, Enum.EasingStyle.Linear, Enum.EasingDirection.In, 0, false, 0)
    local tween = TweenService:Create(obj,ti,properties)
    tween:Play()
    return tween
end

cfv.Changed:Connect(function(val)
    model:SetPrimaryPartCFrame(val) --change the cframe of the model each time the CFrameValue changes
end)

Tween(cfv, 3, CFrame.new(20,0,0)) --change with your desired time and position