Route 3

The first thing you'll notice is the Pokemon Day Care and the Preschool. Head on up there. There's a few battles-the woman has a Muuna, and the kids have the elemental monkeys, all Lv. 10. Now head past the twins who will challenge you to a double battle. They each have a Purrloin Lv. 10. Keep heading west. When you see the grass, stop and save. Cheren is about to challenge you.
He'll have a Purrloin Lv. 12 regardless of what you picked, and his starter is Lv. 14. Not too hard. Anyway, after you beat him, 2 Team Plasma Grunt run by. Then up comes Bianca with a little girl. Apparently those thugs stole the girl's Pokemon! Go with Cheren to take it back.

Grass

Pidove (40%)

Patrat (20%)

Blitzle (20%)

Lillipup (10%)

Purrloin (10%)
Shaking Grass
Audino (100%)

There's a Super Potion above, in the grass. You can't go south until you track down Team Plasma, so go west. Cheren is standing in front of a cave, but go east first. There's a Breeder with a Patrat. Lillipup, and Pidove, all Lv. 9. She'll give you an Oran Berry, and right past her is a Repel. Now, talk to Cheren and go in the cave!

GO TO WELLSPRING CAVE

After the cave, go south (remember, you couldn't go that way before). There is a Trainer with a Blitzle Lv. 13, with an Antidote right next to him.

When you go down, Cheren will warn you about the thick grass, which has stronger Pokemon. You can even enter into Double Battles in it! By the bottom of the grass there's a Trainer with a Woobat Lv. 13. To the south, right before the bridge, there's a Great Ball. On the bridge is a Trainer with a Patrat and Purrloin, both Lv. 13. There is an Awakening by the flowers, and one last Trainer. He has a Pidove Lv. 12 and a Roggenrola Lv. 12. That's it on this Route, so head to Nacrene City!
GO TO NACRENE CITY