Your console is not running as a login shell and hence have no access to rvm function. If you are running Ubuntu, you can:
Type bash --login from your terminal. And then give rvm use 2.0.0
bash --login
rvm use 2.0.0
It seems like your rvm does not load ".bash_profile" properly. I have done to fix it in MAC OS X or Ubuntu 14.04 by opening terminal and write:
source ~/.rvm/scripts/rvm