Oddish, Vileplume, Gloom, or Lotad
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The leaf stone will evolve certain species of pokemon
Chikorita.
bills grandfather asks you for the Pokemon with leafs on its head (oddish) cath it if u have it great show it to bills grandfather and he'll give you a leaf stone
Head to Cerulean city then head south towards Saffron when you get to the entrance to the guard booth there should be a house behind you with the one one ledges leading towards it this is the daycare centre you are looking for. This is also the same for Pokemon fire red, leaf green, red and blue. Hope this helps you out.
You get a leaf stone underground.