Blastoise has the following attacks: Hydro Pump - 80 damageIf this Pokmon has at least 2 extra [water] Energy attached, this attack does 60 more damage.
An option players can exploit is to also add to their deck Exodius, The Ultimate Forbidden Lord, a Lv10 monster that can attack only by sending a Normal monster to the graveyard
Finally, take a close look at the edge of the card since a real one will have a very thin sheet of black between the two sides, which fake cards wont have
The downside is setting Kosei up, as youll need to enchant, equip, and add a counter to it
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[3] If this card is sent to the GY: You can Special Summon 1 monster with 800 ATK & 1000 DEF from your Deck, also you cannot Special Summon monsters from the Extra Deck for the rest of the turn