Pokémon TCG Pocket is just a few months old, and it's already receiving its first major update, adding more cards for collectors. Its latest Mythical Island expansion adds almost ninety new Pokémon cards, so it can be daunting to figure out which are the best ones to focus on.

Thanks to the first expansion of Pokémon Trading Card Game Pocket, you can now add powerhouse cards like Celebi and Mew to your deck.

The Celebi Ex Serperior grass deck looks set to take the Pokémon Pocket TCG by storm - here's how to beat the Mythical Island menace.