...Well, Snivy would have some difficulty against gyms 1, 3, 6, and 7; Oshawott really only has a tough time with gyms 1 and 4, and Tepig (though I haven't had one)... 1 and 5. (All of them will have a tough time with 1 because you have to battle the one who uses the type that's strong against your starter, but the best thing to do beforehand is to go to the Dream Yard and get Pansage, Pansear, or Panpour--whichever is weak against your starter, because it'll be strong against the one of whoever you battle out of Cilan, Chili, or Cress. Hope this info helps.) ^^