My team is tentacruel, infernape, mega venusaur, skarmory, and noivern. I need a physical dark type for coverage (severe psychic weakness). What pokemkn should I use that is a physical dark type, but with good coverage?
Just to add to the Noivern discussion, but it shouldn't use Boomburst ever. It's strong sure, but it lacks coverage and is redundant with Noivern's Dragon STAB:
-Draco Meteor
-Flamethrower
-Focus Blast
-Switcheroo/Hurricane/U-turn
Nature: Timid
EVs: 4 Def/252 SAtk/252 Spe
Item: Choice Specs
Ability: Frisk/Infiltrator
Recommended sets for the Pokemon you mentioned (I agree with replacing Tentacruel; it's just too mediocre):
Infernape:
-Fire Blast/Flare Blitz
-Close Combat
-Thunder Punch
-Mach Punch/Hidden Power (Ice)/Grass Knot
Nature: Hasty/Naive
EVs: 168 Atk/88 SAtk/252 Spe
Item: Life Orb/Expert Belt
Ability: Iron Fist
Mega Venusaur:
-Giga Drain
-Sludge Bomb
-Sleep Powder/Leech Seed/Earthquake
-Synthesis
Nature: Bold/Relaxed
EVs: 240 HP/252 Def/16 Spe
Item: Venusaurite
or
-Giga Drain
-Sludge Bomb
-Hidden Power (Fire)
-Synthesis/Leech Seed
Nature: Modest
EVs: 240 HP/252 SAtk/16 Spe
Item: Venusaurite
Skarmory:
-Whirlwind
-Roost
-Stealth Rock/Spikes/Brave Bird
-Defog/Brave Bird
Nature: Bold/Impish
EVs: 252 HP/252 Def/4 SDef or 252 HP/16 Def/240 SDef
Item: Leftovers/Rocky Helmet
Ability: Sturdy
Bisharp and Tyranitar are pretty good. You could also swap Tentacruel with Starmie or Mandibuzz.
To add, sets for each of what Zekrom mentioned:
Bisharp:
-Sucker Punch
-Iron Head
-Knock Off
-Pursuit/Swords Dance
Nature: Adamant
EVs: 4 HP/252 Atk/252 Spe
Item: Dread Plate/Black Glasses/Life Orb
Ability: Defiant
Tyranitar:
-Stone Edge
-Crunch
-Pursuit
-Earthquake/Ice Punch
Nature: Jolly/Adamant
EVs: 252 Atk/4 Def/252 Spe (Jolly) or 180 HP/252 Atk/76 Spe (Adamant)
Item: Choice Scarf (Jolly)/Choice Band (Adamant)
Ability: Sand Stream
or
-Crunch
-Stone Edge/Ice Beam
-Earthquake
-Stealth Rock/Fire Blast
Nature: Impish/Relaxed
EVs: 248 HP/252 Def/8 SDef
Item: Leftovers
Ability: Sand Stream