@ Dande, I posted a mini-guide for making competitive teams from scratch. [URL="http://www.serebiiforums.com/showthread.php?617743-Super-Training-EV-IV-Thread&p=16723748#post16723748"=http://www.serebiiforums.com/showthread.php?617743-Super-Training-EV-IV-Thread&p=16723748#post16723748]Here's the link.[/URL] The best thing to have in mind when making a Battle maison team is "What will I be doing?". Will you be doing Singles, Doubles or Triples? What Pokemon would you like to use, what Pokemon do you have that you can use? Which Pokemon work well together? Competitive battling isn't about having 6 super strong Pokemon that can "do everything on their own". You need a Pokemon for support, walling, sponging, switching it, sweeping, tanking, statuses and you need six Pokemon that cover each other well. I.E. running a team of Aggron, Lucario, Excadrill, Steelix, Bastiodon and Metagross isn't the best idea because they all share common weaknesses. When building a team you want to try not have any typings overlap as well as weaknesses. Also think about offensive capabilities vs defensive capabilities; Avalugg is an Ice type with amazing defense, but only one resistance... Not the best. On the other hand, Swampert is an amazing Pokemon with only one weakness... but with terrible speed. Think of a Pokemon to act as a center-piece to your team - seeing as how you're new, pick a mega Pokemon - and find other Pokemon that can help it. Here's an example of a team revolving around Mega-Lucario:
Mega Lucario @ Lucarionite
Timid | 252 Special Attack / 252 Speed
Nasty Plot - Shadow Ball - Flash Cannon - Vacuum Wave
His role is a special set-up sweeper. He comes in mid to late game to finish off the other team or can be your lead as you punch holes through your enemy's team. Try and get the Nasty Plot off and then proceed to hit with the best move for the time. Vacuum Wave is priority to finish off faster Pokemon while the other moves provide great coverage... Now you want something that can do the same as Lucario, but resists what he is weak to and hit from a physical side.
Scizor @ Leftovers w/ Technician
Adamant | 252 HP / 252 Attack
Roost - Bullet Punch - Wing Attack - Night Slash
Although he does share a weakness with Lucario, Scizor is very capable of surviving hits. This set capitalizes on lengthy survival, forgoing any need to set up.
Rotom-W @ Chesto Berry
Calm | 252 HP / 56 Special Attack / 196 Special Defense
Will-o-Wisp - Hex - Hydro Pump - Thunderbolt/ Volt Switch
Rounding out the weaknesses while also being able to do some damage and hand out status, Rotom-W is a great addition to the combo of Scizor and Lucario.
My best suggestion would have to be that you just explore Smogon to learn more about competitive if you're interested.