Both in-game and competitively, Liepard is terrible because it's held back by its shallow move pool, poor defenses and average offensive stats. Zebstrika's stats are good, but it has a shallow move pool, meaning that it's good in-game, but not so competitively. Woobat isn't very good too for the reasons I pointed above, but when B2/W2 roll around, Simple should be the preferred ability because it doubles any stat boosts (and drops) Woobat gets; this goes hand-in-hand with Calm Mind. Out of your current team lineup, Timburr is the only one who's viable in OU; Conkeldurr, its fully evolved form, has very high Attack, good bulk and a decent movepool. But you must breed for it to have its good moves, Mach Punch and Drain Punch; for now, Timburr has to breed with a Hitmonchan that knows the above moves (Hitmonchan must be transferred from a Gen IV game knowing both moves post-game). When B2/W2 roll around, you can just teach Hitmonchan Drain Punch via move tutor, have it learn Mach Punch, then breed with (a female) Timburr.
If you want to be competitive, know your tiers. I'm sure you read the tier link I showed you before.
Oh and another thing: you must know about EVs! I nearly forgot about that. Basically, they're "hidden" values that your Pokemon get after defeating an opposing Pokemon. I'm pretty bad at explaining this so here's a link to help you get started on that.