In Pokemon GO, Cliff is one of three Counters you should to defeat in the leaders of Team GO Rocket, who is powerful creatures at their disposal. Here’s how to find and beat him.

 
 

Cliff is the first of the Team Go Rocket Executives and their counterpart to Team Mystic's Leader Blanche. Cliff brings in a team of three Pokémon with the second and third being chosen from a pool of different strong Shadow Pokémon. Fortunately, you can battle an Executive as many times as it takes to beat them. So, if you lose the first time, take note of which Pokémon fill those second and third slots and plan your next attack accordingly.
 
How to Find Cliff
Even though players with Rocket Radars are the only ones able to detect hideouts for the leaders, they can still collaborate since hideouts appear to players in the same places, according to the blog post. After you create your first Rocket Radar, the items will then be available to purchase from the in-game shop with PokeCoins, according to Niantic’s support website. Only players level eight and above can get Mysterious Components and take on the Leaders, according to the website. According to Pokemon Go Hub, bosses are only available from 6 a.m. to 10 p.m. Unlike standard Team GO Rocket Grunts, Leaders can use Shields. Keep that in mind as you use Charge Moves.
 
Cliff’s Pokémon Line-Up
Cliff always uses Pinsir as his first Pokémon. Cliff’s second Pokémon can be Marowak, Onix or Electivire. Cliff’s third Pokemon can be Tyranitar, Swampert or Torterra.
 
How to Beat Cliff
PinsirPokémon is weak to fire, giving you a few options. Here’s the best counters: Moltres with Fire Spin and Overheat, Blaziken with Fire Spin and Blaze Kick, Chandelure with Fire Spin and Overheat, or Volcarona with Fire Spin and Overheat. Now this is where things get tricky as Cliff can toss out Marowak, Omastar, or Electivire, each with their own counters. So here’s your best options. For Marowak you can use Lugia with Extrasensory and Sky Attack, Tropius with Razor Leaf and Leaf Blade, Gyarados with Waterfall and Crunch, or Altered Forme Giratina with Dragon Breath and Dragon Claw. If he uses Omastar you can go with Torterra with Razor Leaf and Frenzy Plant, Venusaur with Vine Whip and Frenzy Plant, Abomasnow with Razor Leaf and Energy Ball, Leafeon with Razor Leaf and Leaf Blade, or Bellossom with Razor Leaf and Leaf Blade. But if he is using Electivire you should go with one of the following: Garchomp with Mud Shot and Sand Tomb, Altered Forme Giratina with Dragon Breath and Ancient Power, Rhyperior with Mud Slap and Stone Edge, Origin Forme Giratina with Shadow Claw and Shadow Ball, or Flygon with Mud Shot and Earth Power.
 
Hope this guide can help you to defeat Cliff, and earn the rewards you want to get.