Lomachenko wins fights by making adjustments and Terance Crawford is the same way. Who are the greatest ever in this category?
Floyd Mayweather Jr, Lennox Lewis, Muhammad Ali, Tyson Fury, Wladimir Klitschko, Michael Spinks, Larry Holmes, James Toney, Roberto Duran, Sugar Ray Robinson, Sugar Ray Leonard because of the Duran rematch, Joe Calzaghe
I think in order to reach any kind of real elite level of competence one essentially HAS to exhibit this ability. It's probably easier to eliminate those champs that don't have it than to name those that do.
Shinsuke Yamanaka is a good recent example. Everyone talks about his beastly KO power, but his adaption to opponents was great, especially considering his deceiving 'one dimensional' style. A lot of his (brutal) knockouts come after the 6th round.