Sorry if the composition seems dumb, but I've only made this team by learning from watching Wi-Fi battles. This is also my first time composing an actual team.
Greninja@Life Orb
Ability: Protean
Nature: Timid
252 Speed/252 SpA/4HP
- Taunt
- Surf
- U-turn
- Ice Beam
Tyranitar@Focus Sash
Ability: Sand stream
Nature: Jolly
128 HP/252 Atk/132 Speed
- Pursuit
- Stealth Rock
- Crunch
- Stone Edge
Gengar@Black Sludge/Gengarite *Because of the ban on Mega Gengar
Ability: Levitate/Shadow Tag
Nature: Timid
252 SpA/252 Speed/4 SpD
- Substitute
- Disable
- Shadow Ball
- Focus Blast
Scizor@Choice Band
Ability: Technician
Nature: Adamant
252 Atk/252 HP/4 Def
- U-Turn
- Bullet Punch
- Quick Attack
- Brick Break
Klefki@Leftovers
Ability: Prankster
Nature: Bold
252 HP/128 SpD/128 Def/4 Speed
- Spikes
- Foul Play
- Reflect
- Light Screen
Gliscor@Toxic Orb
Ability: Poison Heal
Nature: Jolly
252 Speed/252 HP/4 Def
- Roost
- Toxic
- Protect
- Whirlwind
Now please clarify me if what I state maybe incorrect. My point of having Greninja as lead is the because of his amazing speed + taunt, most leads I see are supports but in the event that the opponent's lead is not a support, I'd U-turn to a pokemon that can take a hit (Gengar or Tyranitar are examples) and then I'd either keep him for late game or sweep most of the opponent's pokemon early. Tyranitar has a mixed set, with the EV spread + Jolly I can atleast out speed a couple of pokemons (I'm not sure on this); I also want to keep Tyranitar alive as much as possible for switch's or U-turns for his Sand stream. Gengar, I just picked him because he's pretty strong atm, and can delay for awhile for that sandstorm. Scizor has this EV spread because I primarily focused on the use of those priority moves (I could change this to 252 Spd EV and add different moves). Klefki, a wall support. Finally Gliscor, my strategy with this guy is to delay and to toxic most of the opponents team while switching-out the opponent's pokemon and receiving hazard damage.