The first Gym is not too tough, provided you have a good Water or Grass-Type Pokémon. The dominant Type here is Rock , so avoid using Fire and Flying Types. If you chose Mudkip or Treecko and leveled it up, you'll be set. If you took Torchic, you'll want to have captured a Lotad and leveled it up so that it knows Absorb (Level 7), and also teach it Bullet Seed (TM09). With a souped-up Lotad and (hopefully) your new Makuhita, this Gym will go smoothly.