Asking / Answering questions gives you 0 points.
Selecting best answer gives you 2 points.
Getting best answer gives you 20 points.
Getting up-voted gives you 10 points.
Getting down-voted makes you lose 10 points.
Down-voting a user makes you lose 2 points.
Pokebase Point Equation: (# of BA selected)x2 + (# of UpVotes)x10 + (# of BA)x20 - (# of Down-Votes given)x2 - (# of DownVotes)x10
Questions/answers on the meta don't add points to your actual score. however there is (If you care) a meta points system. http://pokemondb.net/pokebase/meta/7021/is-there-a-seperate-point-system-for-meta
These point values are subject to change as Pokemaster sees fit. They've changed in the past, and certainly can change again.
Taken from myself, here.