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This supports a sharper display appearance

you cannot Special Summon from the Extra Deck for the rest of this turn, except Xyz Monsters, also Special Summon up to 3 "Baby Spider" from your hand and/or Deck, and if you do, they become Level 5, but cannot be used as material for an Xyz Summon, except the Xyz Summon of a DARK monster

The bigger your deck, the more powerful it becomes

The only downside of Thunderbolt is that all energy cards attached to Pikachu must be discarded after attacking, so realistically Thunderbolt can only be used once every other turn assuming the player gets at least one electric energy on Pikachu for their next turn

While they don't necessarily have a guaranteed favorite between them, the unpredictability of Palkia and Dialga's battle comes down to their art, as this card is noticeably brighter and easier to distinguish from afar than Dialga's