The three Team GO Rocket Leaders present some of the most challenging battles you'll encounter this month in Pokémon GO. However, with knowledge of their Pokémon line-ups and the best counters, victory is well within reach. Each leader fields a unique and powerful team, and defeating all three in August 2025 is essential if you're aiming to challenge the elusive GO Rocket Boss, Giovanni.

Sierra, Cliff, and Arlo each deploy distinct strategies using high CP Shadow Pokémon. After defeating six Team GO Rocket Grunts, these leaders will begin appearing at PokéStops and inside Team GO Rocket Balloons. Before you take them on, here’s everything you need to know to come out on top.

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• Arlo, Cliff, & Sierra Line-ups and Best Counters
• Rewards from Defeating the Leaders

Arlo, Cliff, & Sierra Line-ups & Best Counters

Three Unique Line-ups, One Goal: Victory

Each leader selects from a pool of seven Pokémon, using three per battle. The first Pokémon is always the same, but the second and third are chosen at random. This means if the line-up isn’t favorable, you can exit and try again later. As of August 2025, the rosters for Arlo, Cliff, and Sierra remain unchanged from July.

While all three leaders bring strong teams, Arlo stands out as the toughest opponent in August 2025 due to the wide variety of types he uses. A team of Therian Thundurus, Ho-Oh, and Groudon is highly effective, covering six out of seven of his possible Pokémon. These Legendary and Mythical Pokémon are also powerful enough to overcome matchups where type advantage isn’t on your side.

When battling Cliff, start strong with Mamoswine to counter his Gible. Xerneas complements this well with its Fairy-type moves, which hit hard against Honchkrow, Machamp, and Tyranitar. Therian Thundurus is another excellent choice thanks to its Electric-type coverage.

As for Sierra, her team leans into Dark, Fire, Ground, and Steel types. A trio of Swampert, Terrakion, and Tyranitar can dismantle her line-up efficiently. Swampert, with its Water and Ground typing, dominates multiple threats, while Terrakion and Tyranitar provide strong secondary options.

Rewards for Defeating Arlo, Cliff, & Sierra

Valuable Loot Awaits

Defeating any of the three leaders grants identical and highly valuable rewards. One of the main incentives is progressing toward a battle with GO Rocket Boss Giovanni, but the immediate rewards are just as enticing. Each win gives you a rare 12km Red Egg, one of the hardest-to-obtain eggs in Pokémon GO, capable of hatching rare and region-exclusive Pokémon.

You’ll also get the chance to catch the Shadow Pokémon the leader opens with, giving you an opportunity to add a powerful Shadow Pokémon to your roster. Additionally, you’ll receive a random assortment of useful items, including Max Revives, Ultra Balls, and other high-tier supplies.

Even though their teams haven’t changed for August 2025, Arlo, Cliff, and Sierra remain formidable foes in Pokémon GO. Going in unprepared can lead to defeat—so make sure your counters are ready, your Pokémon are fully powered up, and your strategy is solid before you press “Challenge.”

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