Hi guys. I'm a lowpoly-animator of game models. The thing, is that, in any of my models that I had to animate, i had problems with: WRONG DEFOMRATION. The elbows and the freaking legs give me allways, problems. So, where can I found some info, tutorials, or anything about do a good model for animate correctly? Thanks!

Would be interesting what kind of software you are using. Also interesting would be to have the information of what bones system you are using.

In general:

Mainly it is the fault of wrong rigging. Every bones system has the possibility to connect or to remove knots to/from a Bone/Joint in various ways ... then there are the muscles and tendons ...

With other words: look at your bones system where to adjust the muscles and tendos settings , and how to connect / remove wrong knots from the current Bone . The manual of your software should help you out at this .

Wrong deformation can be caused by a wrong modeled mesh or Skeleton, too. But this happens not this often . Try to shape it again in this case. For example: when there are too much wrong deformations at the armpit, then your arm may be too thick at the point where it hits the shoulder. Or a knot is at the wrong place . Maybe you need more knots to achieve a smoother deformation . Or your Shoulder Joint isn´t placed this good . Or all of the told points needs a fix ... ;)

Every Model is different. And so you need Try and Error for every new Model until it fits. As with most artistic stuff: practice is the key. Better than every Tutorial .

Maybe someone have seen the best tutorial of correct bones arrangement.
Such as
http://www.3dluvr.com/rogueldr/tutorials/ik/ik.html

this might help.

http://www.webreference.com/3d/lesson61/

Also, I heartily suggest you look through here.