It's really your choice as this is an in-game team.
Usually, you should always put a shiny Pokemon you find on your team, but in this case, it might not be the best.
Ursaring has a terrible level up moveset, and basically the only move you'll be using is Slash until Level 67! You get Hammer Arm then, and still that's not a great move. Using TM's and HM's, you can get better moves like Strength and Return, but he still doesn't have that great if a moveset. Quick Feet is still not that great of an ability, and paralysis cancels it out.
It does have a great Move Tutor movepool though. It can learn all the punch moves, (great coverage,) Gunk Shot, Headbutt, and more.
Adamant is a great nature though, you lucked out on that.
In finality, it's up to you. You said that you are planning this team out, so you can use Ursaring until you get your final team member, which is probably what I would do.
Hope I helped!