This is going to look superofftopic but anyway...
I posted this in the Ganondorf forums, but a while ago, I wanted to try to pick up Lucario, since at the time, everyone said he sucked. A guy suggested this on a different site: to practice in stamina mode against a computer higher level than what you can handle (err, best case, lvl 9), and try your best to beat it- no items.
...your HP has to be 100, and your opponent has to be 300.
In a real game, it would be a one-vs-three stock ratio, since 100% is around the amount that people take before getting KO'ed.
considering lvl 9 comps have amazing 'reflexes', it should be good practice for any character.