Go to left route and start walking
From Create Your Own Story
You decide to go left and walking. You keep walking until you find many big tree. You decide to rest for a night as the moon is start glowing.
Suddenly, you heard a little voice from one of the tree. You look at it and find many caterpie is there. You decide to caught one of them. You throw a pokeball to the caterpie.
After a little shake, the pokeball crush and the caterpie look at you angrily. Then, it tackle your Torchic. Your Torchic quickly use tackle to Caterpie. The caterpie HP is now 1/6. You throw a pokeball to caterpie. You got a new pokemon for your team.
Your Torchic is now lvl 11 and learn Leer. And Torchic don't remember about tackle anymore.
Next day, you boost your way and get to Truck City!