EVERYONE in R/R is EASY to beat. espesally Lex and Ansem (cause you have a godly deck) I don't even have a full 2nd HP bar.
And for Lex, use Dark Aura 2x then a whole bunch of Dark Firagas (he's weak against Sleights) then activate the Maleficent Dragon enemy card and do Jump slash attacks (in Dark Mode). And the same thing for Ansem, but don't use D.A. (he blocks most of it)