You are far from useless. All you need is a few empty balls, and you can catch a few wild Pokémon to get yourself started. Once that is done, you merely need to train them a bit and learn how to use their attacks to their fullest.

[As if to give an exemple, Esuna the Butterfree uses Sleep Powder on a nearby Pidgey, and Rosie follows that with a Wake-Up Slap. Instant KO.]