No, you can't get Pichu as a Starter. But you can breed a Pikachu with a Ditto at the Four Island Daycare to get one, but you have to beat the game in order to do that.
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In Sapphire, there is Electrike, Manectric, Pikachu, Pichu(breeding), Raichu(evolve), Voltorb, Electrode, Plusle, Minun, Magnemite, Magneton, Chinchou, Lanturn, Zapdos(trade from FireRed or LeafGreen), and Jolteon(trade from FireRed and LeafGreen).
pokemon breeder in route 210 he has pichu, happiny,pikachu
you will not get a Pokemon from pichu and raichu they will just level up but if there was even the slightest chance of a Pokemon appearing it would be a pichu or pikachu
no
pichu