Not in specific order:

Muhammed ali

Floyd mayweather jr.

Sugar ray robinson.

Sugar ray leonard.

Pernell whitaker.

Outside:

Ali

Larry Holmes

Carlos Monzon

Tommy Hearns

Luis Manuel Rodriguez

Defensive:

Nicolino Locche

Floyd Mayweather

Pernell Whitaker

Ivan Calderon

Wilfred Benitez

5 ali

4 pep

3 robinson

2 prime tyson

1 whitaker

In no particular order: Pep, Robinson, Ali, Leonard, Mayweather

I agree with Alkhal but on defensive fighters i would add this men;