The best Pokemon TCG Pocket ex Starter deck is probably the Dark-type Paldean Clodsire ex deck, at least at time of writing, but in reality the answer is a lot more complicated than that. There are nine ex Starter decks in PTCGP that players can pick between once they complete the associated challenge missions,

If you want a deck to use as a basis upon which to build an even better deck, the Water-type Wugtrio ex starter deck is the best way to go. Not only is Wugtrio ex a pretty fantastic Pokémon ex card in its own right, but the deck also includes the fantastic combo of Tatsugiri and Dondozo — two strong basic cards that complement each other very well.

A free starter ex deck isn’t the only decent reward you can get as part of this event. You can also get a shiny Cyclizar promo card and some bonus Shining Revelry packs. So make sure you check out the other missions after you get your deck.