How would I create a teleporter that requires a tool?

So let's put in the portal and a function that detects if a player touched it (the script's parent is the teleporter):

script.Parent.Touched:Connect(function(hit)

end)

But that function ONLY detects touches. So if another part randomly touches it, this function will activate too. SO let's add an if statement to detect if it's a player:

script.Parent.Touched:Connect(function(hit)
    if hit.Parent:FindFirstChild("Humanoid") ~= nil then

    end
end)

What I did is to verify if the hit's parent has a child called "Humanoid", because every Roblox characters have the child "Humanoid". ~= nil signifies "it's not not there" that is the same thing as "it's there" Now, let's detect if the player has the specific toll you told in the question:

script.Parent.Touched:Connect(function(hit)
    if hit.Parent:FindFirstChild("Humanoid") ~= nil then
        local player = game.Players:WaitForChild(hit.Parent.Name) -- getting the player
        if player.Backpack:FindFirstChild("YOUR TOOL NAME HERE") ~= nil then

        end
    end
end)

At line 4, the script will verify if the player has the tool in his backpack. However, when the tool is equipped by the player, it will DISAPPEAR in player.Backpack and it will go in the player's inventory and if the players is unequipping it, it will go back in player.Backpack. But when the player touches the portal, we don't know if the player is equipping the tool or not. So let's add something at line 4:

script.Parent.Touched:Connect(function(hit)
    if hit.Parent:FindFirstChild("Humanoid") ~= nil then
        local player = game.Players:WaitForChild(hit.Parent.Name) -- getting the player
        if player.Backpack:FindFirstChild("YOUR TOOL NAME HERE") ~= nil or hit.Parent:FindFirstChild("YOUR TOOL NAME HERE") ~= nil then

        end
    end
end)

Now let's add the teleporting script:

script.Parent.Touched:Connect(function(hit)
    if hit.Parent:FindFirstChild("Humanoid") ~= nil then
        local player = game.Players:WaitForChild(hit.Parent.Name) -- getting the player
        if player.Backpack:FindFirstChild("YOUR TOOL NAME HERE") ~= nil or hit.Parent:FindFirstChild("YOUR TOOL NAME HERE") ~= nil then
            player.Character.HumanoidRootPart.CFrame = CFrame.new(game.Workspace:WaitForChild(YOUR TELEPORT PART NAME HERE).Position)
        end
    end
end)

So that's it, but make sure to disable CANCOLLIDE, anchor the part and to put it a bit HIGHER to the ground, else the player will be stuck in the ground after teleporting. If you want the player to EQUIP the tool to teleport, delete line all the stuff BEFORE the "or" at line 4 and replace "or" by a "if".

You have to put this script in a script INSIDE the portal.

I hope this helped!

Depending on whether or not you want the tool to be equipped when using the teleporter, you would need to check either the players character, or the players backpack.

Example

If the tool needs to be equipped;

local plrService = game:GetService("Players")
local teleporter1 = script.Parent:FindFirstChild("Teleporter1")
local teleporter2 = script.Parent:FindFirstChild("Teleporter2") 

local debounce = false

---------------------------------------------------------------------
local function searchbackpack(plr) -- function to do the searching. Keeps the script clean

    for i, v in pairs(plr.Backpack:GetChildren()) do --looks at all the children under backpack.
        if v:FindFirstChild("TeleporterKey") then --Finds a value object within the tool
            if v:IsA("Tool") then --Checks if the child is indeed a Tool
                return true --returns true and the script continues
            end
        end
    end

end
---------------------------------------------------------------------

---------------------------------------------------------------------
teleporter1.Touched:Connect(function(hit)
    if debounce == true then return end
    local plr = plrService:GetPlayerFromCharacter(hit.Parent)
    if not plr then return end
    debounce = true

    local success = searchbackpack(plr) --success will be set to true on line 12 if it passes all the checks.

    if success then
        plr.Character:MoveTo(teleporter2.Position)
    end

    wait(1)
    debounce = false

end)
---------------------------------------------------------------------

You can search the backpack if the tool doesn't need to be equipped, else search the character of the player.

With any further help, my discord is; Despayr#2834