I think it would be Earthquake. Even though there are other moves like Hyper Beam that has more basic power, Earthquake gets STAB bonus since it is a Ground attack and Tyranitar is also a Ground type. It is also a physical attack and Tyranitar has better Attack than Sp. Attack.
1.sack attack 2.dudoh best move ever!!!!! 3.struggle 4.splash
Dark Pulse(STAB Move) Flamethrower(Grass and Ice Types) Earthquake(Not a STAB move but still good) Thunderbolt(Water Types) Try that.
Earthquake, fire fang, flamethrower and hyper beam. Maybe strength if you want it to learn that.
Tyranitar is a Rock- and Dark-Type, so it is weak against Water-Types, Grass-Types, Ground-Types, Bug-Types, and Steel-Types, and exceptionally weak against Fighting-Types.
These Pokemon are weak to flying type moves and also phycic type moves. And also ghost type moves are not super effective but a fighting type move can't do damage to a ghost type Pokemon. Unless your opponent used forsight.
Ghost-Types are weak against Dark-Types and other Ghost-Types.
Normal types are strong against ghost types but at the same time they can't effect ghost types. Normal types have no strengths against any other type.
Strong ground and psychic Pokemon such as Claydol, Metagross, and Tyranitar. Both ground and psychic moves are super-effective against poison. They are both multiplied by 2. A good ground type move is earthquake, but since many poison Pokemon have levitate or are flying, they can avoid this. It depends on dual types, abilities, available moves, etc., of both Pokemon, but the strongest Pokemon against poison Pokemon generally would be the strongest psychic and ground Pokemon. Some excellent psychic and ground Pokemon (strongest is quite subjective, so there's no definite answer) are Metagross and Tyranitar, respectively. Claydol is a strong Psychic and Ground dual-type Pokemon.
The Best Bird Pokemon Flying Pokemon would be:SalamenceAttacks:Hidden Power [Flying]EarthquakeRock SlideFlamethrower / Double-Edge / Brick BreakOr You could have a:StaraptorAttacks:- Brave Bird- Return / Double-Edge- Close Combat- Pursuit / Quick Attack / U-Turn
Dragon-Type moves are only strong against other Dragon-Types. Dragon-Type Pokémon are strong against Fire-Types, Water-Types, Electric-Types, and Grass-Types.
Poison-Type moves are only strong against Grass-Types. Poison-Type Pokémon are strong against Grass-Types, Bug-Types, Fighting-Types, and other Poison-Types.
Ground Type moves are super effective against Electric Types.
Bug-type Pokemon are strong against Grass, Fighting, and Ground-type moves.
Electric-Type moves are strong against Water-Types and Flying-Types. Electric-Type Pokémon are strong against Flying-Types, Steel-Types, and other Electric-Types.
Water-Type moves are strong against Fire-Types, Rock-Types, and Ground-Types. Water-Type Pokémon are strong against Fire-Types, Ice-Types, Steel-Types, and other Water-Types.
Fighting types are weak against psychic and flying types.
Psychic-Type moves are weak against Steel-Types and other Psychic-Types. Psychic-Type Pokémon are weak against Ghost-Types, Bug-Types, and Dark-Types.
Water-Type moves are weak against Grass-Types, Dragon-Types, and other Water-Types. Water-Type Pokémon are weak against Electric-Types and Grass-Types.
Rock-Type moves are weak against Fighting-Types, Ground-Types, and Steel-Types. Rock-Type Pokémon are weak against Water-Types, Grass-Types, Fighting-Types, Ground-Types, and Steel-Types.
Psychic type moves are not effective against other Psychic types and Steel Types.
Fire, Fighting and Ground Type moves are super effective against Steel Types.