What Team is the best for the battle frontier?

just one level 100.

Not necessarily. If you have the three regis at lv 50 they are the best battle frontier lv 50 team and at lv 100 they make the best lv 100 team as pyramid king Brandon has these Pokemon and he is the strongest frontier leader.

I agree but what i'd like too find, and am searching for is the best team to counteract all pokemon including brandon's regies that are non legendary too put up more of a challange pokemon ive found too be extremely useful were walrein, hitmonchan and metagross. The reason why i chose hitmonchan is obvious his high attack power, and variety of attack moves such as fire punch (etc.). Walrein because he's quite balanced in his attacks say you wana use a moves that reduces spa than he can just transfer too att. and it will go fine. Finaly metagross for his defensive power with iron defense and high att. p.s. if your planning on using a dragon type, and its salamence, catch a few of bagon go to the move tutor's house and check if one of them knows fire fang or thunder fang its a great move to have since salamence is a att. pokemon.