Since Pikachu ex is a Tera Pokmon, Noctowl [Stellar Crown] seems like a solid inclusion to search out all of the cool Trainer cards that you can include in this deck, like the aforementioned Crispin, or even finish games off with Briar [Stellar Crown]
Really, what needs to be done is to have a gameplan against decks running full suites of Spell/Trap removal, as stun notably folds to cards like Lightning Storm without recourse, given your core engine only provides means to interact with Monsters
Powerwise I'm aiming between Arrogant Wurm and Shadowgrange Archfiend who was making players cry in conjunction with Lion's Eye Diamond and Hogaak, Arisen Necropolis and was subsequently removed from the cube
cards are the main resource in the One Piece card game, because theyre used to pay for playing cards and boosting attacks
-Also you can only have "ONE" active FSC on the field at a time