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,

Unlike the mainline games — which require special items and potentially hours of searching to find a shiny Pokémon — getting shinies in TCG Pocket is pretty straightforward: All you need to do is get very lucky.