I'm a VGC player, so I play the rated doubles ladder regularly. In my experience, teams on Battle Spot are similar to the ones found at live tournaments, so the ladder is great practice.
Do you play on the Battle Spot often and how do you climb that ladder with that Kangaskhan around? Or do you use it yourself and it's proven to help you climb the ladder.
Both (If we're talking doubles; I have no experience with singles). I'm currently running an adamant kangaskhan that hits like a truck. In order to compensate for the fact that it's slower than opposing jolly kangaskhan, I have a thundurus that paralyzes said kangaskhan. As an additional check, I also run a jolly expert belt virizion that outspeeds all kangaskhan and OHKOs them with close combat, unless they've invested significantly in HP.