If there is an Ink cost next to the ability, then exert that number of cards in your Inkwell to activate the ability
it does belong to Chatot after all
If I look on the Bulbapedia page for the Victory Medals, I see the following information for the Pikachu Victory Medals, with the portion in bold highlighting this golden 2005 version in particular: This card was first released in Japan as an Unnumbered Promotional card, and was awarded to the winners of regional GymChallenge events held in game shops and store chains across the country between March and early May 2005
Combine this with an inflated interested in collectible TCGs' rarest targets spurred by the pandemic and, while nowhere near its peak, maintaining a fair bit of popularity on streams and YouTube
Unfortunately, none of that love transferred to the TCG
Im getting a headache just thinking about it