Question: what gen 1 pokemon need stones to evolve?
Answer: Pikachu -> Raichu w/ Thunderstone. Nidorina -> Nidoqueen w/ Moon Stone. Nidorino -> Nidoking w/ Moon Stone. Clefairy -> Clefable w/ Moon Stone. Vulpix -> Ninetales w/ Fire Stone. Jigglypuff -> Wigglytuff w/ Moon Stone. Gloom -> Vileplume w/ Leaf Stone. Gloom -> Bellossom w/ Sun Stone.