Great question. No, negative divergence on all or even any indicator is not necessary for a trend reversal although I certainly prefer to confirm bearish reversal patterns, such as a rising wedge, with negative divergences. The fact that the RSI, of just about all indicators available, has made a new high actually helps to solidify the bearish case IMO. The daily RSI 14 is now at an extremely rare extreme reading of above 80. See chart below for the historical performance of the stock market following all post 80+ RSI readings.