Verified answer

In the beginning, Lillipup is an all-around Pokemon that you can get. Also, if you visit the Dreamyard to the east of Striaton City,there is a person who will give you Pansear(since you chose Oshawott as your starter), which is useful for the first Gym.

Also, the link below in the source has an excellent walkthrough, with Pokemon reviews, which can help you with choosing a team. Good luck!

Go to pokemon marriland and check out the walkthrogh.

But use your team,do not use the walkthroughs team.