I've been playing around with a lot of different themed decks in Pokemon TCG Pocket, but the one that has been giving me the most wins online has definitely been my Pikachu ex deck. Just today alone, I hopped online to try out a few matches, and I won six matches in a row with this bad boy. Now, this may not be the ultimate, S-tier best deck ever that includes Pikachu ex, but this one is a fantastic one to start with (at least, I think so).