I agree with with Luke in saying you should go with Alakazam, Salamence, or another suggestion from me would be Hariyama. However, I'd have to disagree with the movesets
Alakazam:
Synchronize Ability
Psychic: Great STAB, 100% accuracy
Shadow Ball: Great coverage against ghost weakness and other psychics
Calm Mind: To boost special attack and special defense
Energy Ball/Focus Blast/Dazzling Gleam/ Reflect: Your choice of coverage based off of your team or reflect to boosts defenses
Salamence:
Intimidate Ability
Dragon Claw: Great STAB, 100% accuracy
Stone Edge: Great coverage against many types including its biggest weakness, ice
Earthquake: Strong move, more coverage, especially against rock types
Dragon Dance: Boosts attack and speed
Hariyama:
Guts Ability
Bulk up: Gets attack and defense boosted
Brick Break: Strong move with great STAB, removes screens
Earthquake: Strong coverage against many types
Stone Edge: Coverage for flying types