I've been trying to get back into competitive 6th gen battles. I came up with this team but I'm not really sure if this is good or not.
Greninja @ Focus Sash
Ability: Protean
EVs: 252 Atk / 4 Def / 252 Spe
Jolly Nature
- Toxic Spikes
- Spikes
- Taunt
- Shadow Sneak
Scizor @ Scizorite
Ability: Light Metal
EVs: 248 HP / 44 Atk / 16 Def / 200 SpD
Impish Nature
- Swords Dance
- Roost
- Bullet Punch
- Knock Off
Blissey @ Leftovers
Ability: Natural Cure
EVs: 4 HP / 252 Def / 252 SpD
Bold Nature
- Wish
- Soft-Boiled
- Seismic Toss
- Toxic
Rotom-Wash @ Leftovers
Ability: Levitate
EVs: 248 HP / 252 Def / 8 Spe
Bold Nature
- Volt Switch
- Hydro Pump
- Will-O-Wisp
- Pain Split
Espeon @ Leftovers
Ability: Magic Bounce
EVs: 4 Def / 252 SpA / 252 Spe
Timid Nature
- Baton Pass
- Calm Mind
- Psyshock
- Dazzling Gleam
Dragonite @ Lum Berry
Ability: Multiscale
EVs: 252 Atk / 4 Def / 252 Spe
Adamant Nature
- Dragon Dance
- Outrage
- Extreme Speed
- Earthquake
I got these movesets from Smogon. I don't how to build my own custom team.
The Greninja set you're currently using is better suited for the Uber tier. Greninja itself is an Uber, so it can't be used in OU teams. A better hazard lead is Scolipede, as it can make itself faster with Speed Boost, and has Endeavor to severely weaken opponents once its Focus Sash is used up:
-Pin Missile
-Spikes
-Toxic Spikes
-Endeavor
Nature: Jolly
EVs: 252 Atk/4 Def/252 Spe
Item: Focus Sash
Ability: Speed Boost
This team needs Rapid Spin support, as Dragonite is weak to Stealth Rock, which would render Multiscale useless. Excadrill and Starmie are examples of this. Sure, you can use Espeon, but the other two are much better at hazard-clearing duties, as both have better movepools:
Excadrill:
-Earthquake
-Iron Head
-Rock Slide
-Rapid Spin
Nature: Jolly
EVs: 252 Atk/4 Def/252 Spe
Item: Choice Scarf
Ability: Mold Breaker
or
-Earthquake
-Iron Head
-Rapid Spin
-Toxic/Stealth Rock
Nature: Careful
EVs: 252 HP/4 Atk/252 SDef
Item: Leftovers
Ability: Mold Breaker
Starmie:
-Scald
-Psyshock/Reflect Type
-Rapid Spin
-Recover
Nature: Timid
EVs: 248 HP/8 Def/252 Spe
Item: Leftovers
Ability: Natural Cure
or
-Hydro Pump
-Psyshock/Thunderbolt
-Ice Beam/Hidden Power (Fire)
-Rapid Spin
Nature: Timid
EVs: 252 SAtk/4 SDef/252 Spe
Item: Life Orb
Ability: Natural Cure/Analytic