SS OU Please rate my rain team

[OrcaHermelin]

Bors (Pelipper) @ Damp Rock
Ability: Drizzle
EVs: 248 HP / 252 Def / 8 SpA
Bold Nature
- U-turn
- Scald
- Hurricane
- Roost

Galahad (Barraskewda) @ Choice Band
Ability: Swift Swim
EVs: 252 Atk / 4 SpD / 252 Spe
Adamant Nature
- Liquidation
- Drill Run
- Close Combat
- Psychic Fangs

Gawain (Hydreigon) @ Leftovers
Ability: Levitate
EVs: 252 HP / 252 SpA / 4 Spe
Modest Nature
IVs: 0 Atk
- Substitute
- Nasty Plot
- Flash Cannon
- Dark Pulse

Mordred (Cinderace) @ Heavy-Duty Boots
Ability: Blaze
EVs: 252 Atk / 4 SpD / 252 Spe
Jolly Nature
- Court Change
- Pyro Ball
- High Jump Kick
- U-turn

Parceval (Dragapult) @ Choice Scarf
Ability: Infiltrator
EVs: 252 SpA / 4 SpD / 252 Spe
Modest Nature
IVs: 0 Atk
- Shadow Ball
- Thunder
- Flamethrower
- Draco Meteor

Lancelot (Heliolisk) @ Choice Specs
Ability: Dry Skin
EVs: 252 SpA / 4 SpD / 252 Spe
Timid Nature
IVs: 0 Atk
- Grass Knot
- Thunder
- Volt Switch
- Surf

 

[OrcaHermelin]

It is my first team, please send help. The biggest problem is Tyrannitar because my team does nearly no damage, If I didn't predict, but I must choice, but I need a choice Item to do enough damage

 

[Twilight]

Welcome to Smogon! I'm locking your RMT for the time being as the forum rules require that you provide at least 3 lines of descriptions for each Pokemon to explain their roles. Please read the rules carefully and take a look at Team Showcase to see the level of detail we require. PM me with updated descriptions and I'll be happy to unlock this.