Pounce doesn't exactly replace anything. A Spirit Lion Totem Barbarian gives up fast movement, DR, and either uncanny dodge or trapsense, don't remember.
In return it gets Pounce at level 1, a fear effect called Lion's Roar at some later level, and something else.
But I am only taking a single level of Barbarian, because I am primarily a Rogue. As such I am effectivaely giving up Fast Movement for Pounce.