If your Pokmon needs your opponents Active Pokmon to be afflicted by a Special Condition in order to do additional damageor if the additional damage provided by the Poisoned special condition proves relevant for your decks strategyBrute Bonnet may be a useful inclusion
Finally you can use five Merfolk to put a +1/+1 counter on each Merfolk you control, or basically insurance you can break any battlefield stall
Rapid Strike Urshifu [C] Slashing Claw: 40 damage
While this card sells very often, it's frequently in poor condition, as LP copies command a strong base at around $150, with NM cards soaring upward from there when you're lucky enough to find them
$2,800 Australia's forensic-grade card restoration
Pokemon is, somehow, in its 30th year