If this card is sent from the hand or field to the GY as material for the Link Summon of a "Code Talker" monster: You can either add 1 "Cynet" Spell/Trap from your Deck to your hand, or, if this card on the field was used as material, you can add 1 Level 4 Cyberse monster instead
Even for a raw card, this will cost you four figures

Sort Card Type Vivillon #XY137Promo $2.57 Vivillon #15Holo Rare $0.61 Vivillon #8Rare $0.28 Vivillon #13Rare $0.20 Vivillon #10Uncommon $0.15 Vivillon #9Uncommon $0.06 Vivillon #9Uncommon $0.13 Vivillon #5Uncommon $0.24 Vivillon #6Uncommon $0.49 Vivillon #8Rare $4.50 Vivillon - 006/094 #6Uncommon $0.49 Vivillon - 006/106 #6Uncommon $0.39 Vivillon - 007/191 #7Uncommon $0.15 Vivillon - 008/060 #8Rare $9.95 Vivillon - 107/106 #107Art Rare $2.35 Vivillon - 15/162 (Cosmos Holo) #15Promo $0.75 Vivillon - 17/146 (Cosmos Holo) #17Promo $6.05 Vivillon - 193/191 #193Illustration Rare $5.87 Vivillon (High Plains [Orange]) #17Holo Rare $5.95 Vivillon (Meadow [Pink]) #17Holo Rare $1.88 Vivillon - 008/060 #8Rare $9.95 Vivillon - 17/146 (Cosmos Holo) #17Promo $6.05 Vivillon (High Plains [Orange]) #17Holo Rare $5.95 Vivillon - 193/191 #193Illustration Rare $5.87 Vivillon #8Rare $4.50 Vivillon #XY137Promo $2.57 Vivillon - 107/106 #107Art Rare $2.35 Vivillon (Meadow [Pink]) #17Holo Rare $1.88 Vivillon - 15/162 (Cosmos Holo) #15Promo $0.75 Vivillon #15Holo Rare $0.61

It's...probably not necessary
But few people think about how the Pokmon cards backs changed
While Blastoise boasted more HP and the decks namesake, Pokemon Power: Rain Dance, Dark Blastoise was able to up the maximum damage from 60 to 70, making it a more effective finisher for the archetype