You can't, but you can get them all through the global trading system or gts.
Tepig, Oshawott, Snivy
Starters are not given in the form of eggs.
What Pokemon are you looking for? Be more specific. The Pokedex shouldn't be hard to complete.
You can ONLY go to the Unova region without cheats and hacks. Although after you beat the Elite Four, new routes are unlocked with Pokemon from all of the other regions, though this is still in Unova.
one of the full evoulutions of the starters so i'd pick snivy.
boldore(gigalith) and gurdurr(conkeldurr) evovle by trading not sure if there are any others that are from unova
All 3 Unova and Johto starters can be found in Pokémon Sun & Moon!
You can't buy other starters. Trade them over from friends or gts.
The Royal Unova will leave as soon as you get on it. You must show up between 5pm and 8pm or it will leave without you at 8pm.
The starter Pokemon in the Unova region are named Snivy, the Grass-type starter, Tepig, the Fire-type starter, and Oshawott, the Water-type starter.
There are two. One can be gained by speaking to Professor Juniper after you have gained all 8 Unova badges. The other is given by the gift-giving man in Castelia, he gives you rewards after a certain number of pokemon trades, the Masterball is the last one after 50 trades.
Snivy:strong at start weak at end. Tepig:weak at start strong at end. Odhawott:strong at start strong at end. i chose oshawott but you don't have to and this isn't an answer its something to help you choose...