While she can be utilized in numerous ways, building a Narset deck around a Voltron strategy is a viable option, allowing for massive and impactful Auras to be cast for free and placed on your already difficult-to-remove Narset
Many decks, however, like UlForceVeedramon or the D-Reaper strategy have as their main plan to attack continuously by utilizing of their special gimmicks in order to repeatedly strike against your opponent's security
It's not awful and might serve passably in the early game, but we can't really see it having a place in any of the Pokemon TCG Pocket best decks at time of writing
Use Guppys ability to Special Summon Aquaactress Arowana in attack mode from your hand
And with ~3000 attack a piece, this is some serious damage
After all, he is the worlds top duelist until Yugi comes around and those who want to compete will always want the best cards for their deck