Altcoins are always based on bitcoin. When bitcoin falls alts fall most of the times. When bitcoin goes up, in a bull market alts again falls. If it's a bear market like the present market, with pump in bitcoin price, alts also moves upwards. A stable BTC market is always good for alts.
  Bitcoin being the king literally effects all coins with its movement. It will be good if btc movements doesn't effect alts.