If i had one to just chill with and smoke some herb i would definitely choose Bulbasaur. He's so chill and what if he was made out of ganja?
But if i had to fight some douchebag trainer like Gary or Team Rocket i would choose Raichu. Electricity can hurt any Pokemon besides rock types. Now that's a quality Pokemon.
<a href="http://photobucket.com/images/bulbasaur" target="_blank"><img src="http://i789.photobucket.com/albums/yy173/Digital_Cooper33/My%20Favorite%20Pokemon/9a8156cb.png" border="0" alt="Bulbasaur Pictures, Images and Photos"/></a>