l18 mainServer

-- ================  Old code ==================
game.ReplicatedStorage.Remotes.EquipPet.OnServerEvent:Connect(function(player,
    petName, id)
    local petModel = game.ReplicatedFirst.Pets:FindFirstChild(petName):Clone()
    petModel.Parent = workspace.Players:FindFirstChild(player.Name)
-- ============== Comment out / remove the line ==============
    --player.Values.Damage.Value += petModel.Damage.Value
    petModel.Id.Value = id
end)

game.ReplicatedStorage.Remotes.UnequipPet.OnServerEvent:Connect(function(player,
    petName, id)
    local playerFolder = workspace.Players:FindFirstChild(player.Name)
    for i, pet in pairs(playerFolder:GetChildren()) do
     if pet.Id.Value == id then
-- ============== Comment out / remove the line ==============
     --    player.Values.Damage.Value -= pet.Damage.Value
         pet:Destroy()
     end
    end
end)
-- ======================New code=============================
game.ReplicatedStorage.Remotes.Upgrade.OnServerEvent:Connect(function(player, cost, damage)
    player.leaderstats.Shards.Value -= cost
    player.Values.Damage.Value = damage
end)
-- ======================End of new code =================