watch me get yelled at for a lot of these, but I'm picking personal faves that helped me get far in the games.
normal: Snorlax 3333
grass: I'd say Vileplume, but TBH it's not that amazing. (if you can,) Try Celebi, I guess. . .
fire: ugh. I hate fire, so I can't really help there.
water: Lapras is pretty good, IMO
electric: Flaafy/Ampharos are pretty awesome. If not, choose Raichu.
psychic: Gardevoir or Slowking. Slowking has awesome defense, but is horridly slow. Gardevoir is (ok) all around.
ice: Wailren or Frosslass. Both are friggin' awesome
poison: Weezing> Roserade >Venosaur > Vileplume, IMO
flying: Dragonite and/or Togetic.
rock: Bastiodon > Omastar> Cradily
ground: Claydol/Torterra
steel: Jirachi or Metang/Aggron?
fighting: Poliwrath/ Gallade?
dark: Honchrow.
ghost: Gengar +/ Mismagius
bug: Parasect/Vespiqueen
dragon: DRAGONITE
normal: Snorlax 3333
grass: I'd say Vileplume, but TBH it's not that amazing. (if you can,) Try Celebi, I guess. . .
fire: ugh. I hate fire, so I can't really help there.
water: Lapras is pretty good, IMO
electric: Flaafy/Ampharos are pretty awesome. If not, choose Raichu.
psychic: Gardevoir or Slowking. Slowking has awesome defense, but is horridly slow. Gardevoir is (ok) all around.
ice: Wailren or Frosslass. Both are friggin' awesome
poison: Weezing> Roserade >Venosaur > Vileplume, IMO
flying: Dragonite and/or Togetic.
rock: Bastiodon > Omastar> Cradily
ground: Claydol/Torterra
steel: Jirachi or Metang/Aggron?
fighting: Poliwrath/ Gallade?
dark: Honchrow.
ghost: Gengar +/ Mismagius
bug: Parasect/Vespiqueen
dragon: DRAGONITE