How do I make it so the camera won't move if the player tries to move the camera?

Hey iEchoism!

In order to make ROBLOX easier to use, ROBLOX has a default camera mode that keeps the camera centered on the player's character and allows for that camera to be moved in a number of ways. This is the Custom Camera type.

A quick search of the Camera class yields a number of properties we can change. One, in particular, is named CameraType. Upon navigating to the CameraType page (http://wiki.roblox.com/index.php?title=API:Enum/CameraType), we find several types of ways the camera can function.

The one we want is Scriptable. We want to use Scriptable because it allows us to define custom behavior the camera. I've never played Pokemon before, but as far as I can tell, it uses a top-down paradigm for camera placement. To achieve that, we write the following in a LocalScript inside PlayerGui:

local Player    = game.Players.LocalPlayer;
local Camera    = game.Workspace.CurrentCamera;

-- The time of the last camera update. There is no need to change it, it is set automatically.
local LastUpdate    = 0;

-- The delay between camera updates. Change as needed, but try not to make it too small!
local UpdateDelay   = .1;

-- The offset of the camera. Change as needed.
local Offset = Vector3.new(0, 10, 0);

Camera.CameraType = Enum.CameraType.Scriptable;

-- Update the camera position if the last update was more than UpdateDelay seconds ago and the character and his torso exists.
local function Update()
    local conditions = (
        (tick() - LastUpdate) > UpdateDelay and
        Player.Character and
        Player.Character:FindFirstChild("Torso")
    );

    if (conditions) then
        -- Set the camera CFrame equal to the player torso position plus the offset, facing the player
        Camera.CFrame = CFrame.new((Player.Character.Torso.Position + Offset), Player.Character.Torso.Position);
    end;
end;

game:GetService("RunService").Stepped:connect(Update);

I didn't have time to test this code in Studio, so I can't guarantee it will work. Do let me how (and if) it works.

Have a nice day, iEchoism, and best of luck with your game!

Best regards, tkcmdr

Edit: Fixed the CFrame.new() statement to use the character's torso position and implied that the script must be a LocalScript inside the PlayerGui.