Hi I've just started playing pokemon ruby and this is m current team:Marshtomp-Tackle,Bide,Water Gun,Mud Shot;Swellow:Double Team,Steel Wing,Wing Attack,Quick Attack;Vigoroth Scratch,Yawn,Fury Swipes,Slack Off;Nincada-For Cut and Flash.
I am actually at the 3 gym at Wattson.What should I add to my team,a fighting type,etc...?
For a fighting type I'd highly recommend Hariyama, it is relatively bulky being able to take hits and dish them out also. Fake Out allows that priority move to deal damage and make your opponent flinch, Vital Throw makes it's low speed less of a problem, meaning it will always move last in order for never missing. If you can afford a Belly Drum it can easily sweep an opponents team.
I'd also recommend an Aggron and either a Manectrike or Vileplume depending on whether you would prefer an electric type or a grass type.
I'd also suggest a Zigzagoon to be an HM slave, but that's something you probably already know.