Pokémon Competitive team

[pokedude729]

I wan to get into competitive and I was wondering if I could get opinins on my team, before I train a team that isn't good.
Blaziken
Greninja
Garchomp
Either Gardevoir or Metagross (to be decided)

 

[MayorHope]

what are you going to put in your other two slots?

 

[pokedude729]

What would you recommend?

 

[hoobster4]

This is my pokemon X team(Haven't gotten Omega Ruby yet);
-Level 100 Blaziken
-Level 89 Zyguarde(Trading out when I get another pokemon)
-Level 77 Lucario (Trading out when I get another pokemon)
-Level 96 Charizard (Has terrible stats, going to train another one)
-Level 100 Mewtwo
-Level 90 Xerneas

 

[Isabella]

Many op pokemon here.
This kind of team is so common on wi-fi, gets kinda predictable.