Okay chomzloh, go get yourself a Makuhita in Dewford Cave. This will be one of your main members. It must solo Brawly and Winona. Also, when you get to Fortree and find Kecleon, You must kill it with Makuhita's Hidden Power, and only Hidden Power.
If it's Hidden power is Fighting, congrats, solo Wallace with it.
If it's Water, no using it in Victory Road.
Should it be Fire, no using it against the Champion.
Steel = Lucky, no restrictions.
Grass = Makuhita dies after beating Winona. Box it or release it, and bring in a back up.
Electric = Congrats, you must make a detour and go to Pacifidlog Town and get either Return or Frustration TM, before the E4.
Everything else: No Hariyama, ever.
Evolution is fine, should your Hidden Power be Fighting, Water, Fire, Steel, Grass or Electric. Call it "WTF? Argh!".
Just A1 for short. Apparenlty people can't spell Treadshot.
Recent Scramble link
Note: Yes, it is spelt wrong. Deliberately. Shut up, you're not the first to notice.