Mog, Moogle Warrior acts as a discard outlet during your end step
There are yet more options that I haven't gone into, such as Traps that change your opponent's monsters' battle positions at any time (like Windstorm of Etaqua or Curse of Anubis), Spells that keep your opponent's monsters face-down (like Swords of Concealing Light), and Monsters that lock your opponent into not being able to attack at all (like Dyna, Hero Fur Hire)
Legendary Creature - Wizard Avatar Copy (CTRL to add secondary) Creature Bohn, Beguiling Balladeer Each nonland card in your hand without foretell has foretell
In Pokmon TCG Pocket, there are 33 spaces for "A" promo cards
Even if it will never be the focus of a deck, Jigglypuff is going to start appearing in more Pokmon TCG Pocket decks very soon, simply because it provides versatility and stall options to any deck that needs it