I dont think you can get a evve in pokemon ruby,sapphire or emrald.But its worth a try.Try to see and catch them in Safari zone.I think you can get them there but its very rare.Pallet town is not in pokemon ruby,sapphire or emrald.If you want to see pallet town you should play pokemon red(The first game of pokemon)Pokemon red is in Kanto region.This place from where Ash is!