Important points
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Marowak ex is a popular counter for Pikachu ex decks, taking advantage of its weaknesses to deal 200 damage from two energies.
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Weezing and Arbok are used to counter Mewtwo ex due to its Dark typing and trapping opposing Pokémon.
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Starmie ex, Venusaur ex, and Exeggutor ex are successful alternatives to Pikachu and Mewtwo decks in TCG Pocket.
If you've ever played Pokemon Trading Card Game Pocket's battle mode, especially during recent events. You'll notice that a few special decks keep popping up over and over, like Mewtwo ex and Pikachu ex.
These decks quickly became meta after the game launched. This is because players can play incredibly formidable X-cards with massive HP and powerful attacks in one turn.

related
No, you cannot accidentally split your cards in half in Pokemon TCG Pocket.
Don't believe everything you see on the internet.
This caused dissatisfaction among the TCG Pocket community. Many people have shared what they use against these decks.
True Pikachu Ex counter
The most popular counter for Pikachu ex decks focuses on Marowak ex.
By nature Ground-type Pokémon are the number one choice. It takes advantage of Pikachu's weakness and attacks it for an additional 20 damage, and Marowak is king here. Due to a little luck, it was able to hit Pikachu ex with 200 damage with only two energy levels.
There have been many posts popping up on the TCG Pocket subreddit with people swearing about their Marowak decks, which often include Dugtrio and Sandslash, and it certainly seems like a strong response.
True Mewtwo X Counter
In the same way as using Marowak as a counter to Pikachu, players will use Weezing and Arbok to counter Mewtwo.
although TechnicallyThey are both Poison-type Pokemon. In the Pokemon TCG, they are shown as Dark, so attack Mewtwo ex for plus 20 damage.
Weezing/Arbok combination It allows players to poison opposing Pokémon before they can be trapped. Can't retreat These Pokémon take poison damage each turn. When used with Sabrina or Pidgeot, this forces the opponent to switch their active Pokémon. And this deck is a force to be reckoned with.
Other successful TCG Pocket Decks
Another popular choice shared on the Pokemon Trading Card Game Pocket subreddit is the Starmie ex deck, capable of hitting hard and fast with 90 damage from two energies. And the ability to quickly accumulate energy with Misty makes it a popular choice. It suffers a little with Pikachu EX, but only if everything goes as you want. It was a workable choice. Plus bonus points for countering other meta decks—such as Charizard.
Alongside Starmie, one player showed off their Venusaur ex Deck. It wasn't weakened by Pikachu or Mewtwo, and although its energy value was higher with Erika, the deck was great at keeping Pokémon at high HP. strong
Another popular deck that's regularly featured on the TCG Pocket subreddit involves Exeggutor, for example, with a single blast of energy, Exeggutor can deal 80 damage, and its 160 HP means it can resist. Pikachu and Mewtwo's most powerful attacks. Paired with the Butterfree promo from the latest Lapras and Erika challenge, Exeggutor will last even longer. Making it a thorn in the side of those meta decks.

Experience the fun of collecting Pokémon Trading Card Game (TCG) cards with Pokémon Trading Card Game Pocket, a new game for iOS and Android devices from Creatures Inc., the original developer of Pokémon TCG, and DeNA Co., Ltd.
In this game, you will be able to open two booster packs every day at no cost. You can collect digital cards with retro artwork from the past. Including brand new cards exclusive to Pokémon Trading Card Game Pocket.
Look out for the new “Immersive Cards” which will make you feel as if you've jumped into the illustrated world of the cards.