yes, I have to admit, this isn't really a competetive team. it looks more like a powerful in-game team. you seem to be based on "no legendaries" as opposed to "teirs" - this is OK for an In-game scenario, but when it comes to competetive battling, you need to move to different levels (don't worry, there was once a time {not long ago} when I was the same, but everyone learns at some point)
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First of all, you want to have a lead that sets up an Entry Hazard. I suggest this set, due to its typing, defence and speed.
Gliscor @ Leftovers
Ability: Sand Veil
Nature: Jolly
EV's: 252 HP, 4 DEF, 252 Speed
Moveset:
Earthquake
Stealth Rock/Taunt
U-Turn/Taunt
Roost
secondly, you want something to cover for your lead's weaknesses, as this isn't a scuiside lead (like Azelf)
Tentacruel @ Leftovers
Ability: Liquid Ooze
Nature: Calm
EV's: 252 HP, 120 DEF, 136 SDEF
Moves:
Toxic Spikes
Rapid Spin
Surf
Sludge Bomb/HP Fire/Giga Drain
(giga drain is only to help get rid of water types, while HP fire takes out Gliscor's dreaded Ice types)
now, you always have the option here to switch leads, as the two are interchangeable and work very well together
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now, i'm only helping you with leads here, but don't forget that
some legendaries are allowed - if you want to have a proper look at the pokemon you want to use, you should check
here - that is the list of
OU pokemon, which are the best-of-the-best (without being banned)
if you want more help, please PM or VM me, D_A or Aragornbird (i'm no expert, but Dark Azelf and AragornBird are PC's {i'd say best} strategists and competetive battlers)