Top 5 Gen 2 Gym Attackers

These are the Gen 2 Pokemon that you should include in your party when challenging rival gyms. 

source : Official US Pokemon Website Pokedex http://www.pokemon.com/us/pokedex/

Tyranitar

Tyranitar is the very best Gen 2 Pokemon for taking down rival gyms. With his max CP of 3,670 and attack power 251, combined with moves like Fire Blast and Stone Edge which deal over 100 damage each.Tyranitar also has an advantage in his Dark/Rock Pokemon type which allows for him to easily defeat popular gym defenders such as Snorlax, Slowpow, Exeggutor, Lapras, and Dragonite. This is because Tyranitar is immune to Psychic and Normal moves, and Dragonite and Lapras are both weak to Rock-type moves. Not only that, but Tyranitar's STAB (Same Type Attack Bonus) grants 50% bonus damage to all of his Rock type attacks making them extra effective.Tyranitar evolves from Larvitar, which becomes Pupitar and then evolves into Tyranitar. These Pokemon can be found mostly in mountains, parking lots, and nature reserves.If Niantic continues to add new evolutions following the other Pokemon games, Tyranitar will only grow even stronger as he will eventually evolve into Mega Tyranitar. 

source : Official US Pokemon Website Pokedex http://www.pokemon.com/us/pokedex/

Espeon

One of the new eveelutions in the Gen 2 Pokemon Go update is Espeon. This Psychic type Pokemon is currently ranked as the 5th best Gym Attacker due to his max CP of 3,000, base attack of 261, and powerful Psychic abilities such as Psybeam and Future Sight which deals over 40 DPS (damage per second).Espeon is also no slouch when it comes to stamina and defense with a base stamina of 130, and a base defense of 194. This makes him all around, the best eveelution for gym attacks. 

source : Official US Pokemon Website Pokedex http://www.pokemon.com/us/pokedex/

Scizor CP 2741 vs Blissey CP 3099  Dazzling Gleam

Scizor

Scizor's max CP is 2,801. He is a steel/bug type Pokemon who has very few weaknesses. Scizor's base attack is 236, while his base defense is not far behind at 194. Scizor's base stamina is 140 which gives him plenty of staying power to help take down rival gyms.

source : Official US Pokemon Website Pokedex http://www.pokemon.com/us/pokedex/

Heracross CounterCC lv38 5 vs Blissey ZenDG lv38 5

Heracross

The bug/fighting Pokemon, Heracross is a great gym attacker. Heracross has a base attack of 234 along with a base stamina of 160 and base defense of 189.Heracross also uses powerful ground and fighting moves such as Close Combat and Earthquake; both of which deal over 100 damage. And with STAB (Same Type Attack Bonus), Close Combat can reach almost 60 Damage per Second.

source : Official US Pokemon Website Pokedex http://www.pokemon.com/us/pokedex/

Donphan

Another ground type Pokemon, Donphan's max CP is a whopping 3,022 while his base attack and defense are both equally matched at 214.Donphan has some impressive moves like Earthquake which deals 120 damage. Because Donphan is a ground type Pokemon, he also benefits from STAB (Same Type Attack Bonus) allowing Earthquake to deal over 40 DPS (damage per second).

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