once. it was awful. i decided to do a trade between my FireRed and Sapphire, sent Treecko, got cubone. By the time i got to Roxanne (the first gym leader), I Had to run to the pokemon center with the bloody corpse of a cubone at least 70 times (exaggeration!).When i finally finished my cubone was like lvl. 97. it sucked but it was worth it.