This is a team i put together with the best knowledge i have of competitive battling, however this is also my first attempt so please give me some tips!
Lead-
Krookodile @ Choice Scarf
Jolly
Intimidate
-Fire Fang
-Earthquake
-Stealth Rocks
-Pursuit
EVs: Atk 252/Spe 252/HP 4
Ampharos (Mega) @ Ampharosite
Modest
Static
-Thunderbolt
-Dragon Pulse
-Focus Blast
-HP Water
EVs: Def 252/Sp.Atk 252/Spe 4
Umbreon Leftovers
Bold
Synchronize
-Foul Play
-Moonlight
-Heal Bell
-Shadow Ball
EVs: SpD 252/HP 252/Sp.Atk 4
Magnezone @ Choice Specs
Magnet Pull
Modest
-Flash Cannon
-HP Fire
-Thunderbolt
-U-Turn
EVs: Sp.Atk 252/Spe 252/HP 4
Quagsire @ Leftovers
Water Absorb
Calm
-Earthquake
-Amnesia
-Scald
-Ice Punch
EVs: Sp.Def 216/Sp.Atk 148/Def 140
Venasaur @ Life Orb
Overgrow
Sassy
-Power Whip
-Leech Seed
-HP Electric
-Knock Off
EVs: Atk 252/Sp.Def 252/HP 4
Lead-
Krookodile @ Choice Scarf
Jolly
Intimidate
-Fire Fang
-Earthquake
-Stealth Rocks
-Pursuit
EVs: Atk 252/Spe 252/HP 4
Ampharos (Mega) @ Ampharosite
Modest
Static
-Thunderbolt
-Dragon Pulse
-Focus Blast
-HP Water
EVs: Def 252/Sp.Atk 252/Spe 4
Umbreon Leftovers
Bold
Synchronize
-Foul Play
-Moonlight
-Heal Bell
-Shadow Ball
EVs: SpD 252/HP 252/Sp.Atk 4
Magnezone @ Choice Specs
Magnet Pull
Modest
-Flash Cannon
-HP Fire
-Thunderbolt
-U-Turn
EVs: Sp.Atk 252/Spe 252/HP 4
Quagsire @ Leftovers
Water Absorb
Calm
-Earthquake
-Amnesia
-Scald
-Ice Punch
EVs: Sp.Def 216/Sp.Atk 148/Def 140
Venasaur @ Life Orb
Overgrow
Sassy
-Power Whip
-Leech Seed
-HP Electric
-Knock Off
EVs: Atk 252/Sp.Def 252/HP 4