A little something I usually do is dtilt to grab at very low percentages. It's a good mindgame for when people think you might try to Fair afterwards. Just make a slight pause before the grab; too early and you might miss. Works fairly well against the space animals and even meta knight. On the grab, smack them once or twice, then down throw. This'll send them up just a little bit at low percentage. If they DI toward you, try a Down Smash to Bair/Forward B. If they DI away, do a sliding Up Smash the moment after they air dodge (most of the people I've face usually air dodged immediately after being thrown).
Oh and with all those Meta Knight's down smashing left and right all the time, it wouldn't hurt to know how to grab-release the bejesus out of them. When MK's around 60% or so, you could get in at least 2-3 smacks before they break free in the air. Do this across Final D or in some parts of Delfino and you'll get a free 15-20% with that alone. Hope this info helps. Good luck at the tourney :D