The long strip contains data for an additional attack this card can use:
Jump Slash オーバースラッシュ
This attack does X damage to each of your opponent's Benched Pokémon. (Don't apply Weakness and Resistance.)
Selecting "Yes" reveals the value for X.
This card was released in the English Aquapolis expansion, first originating from the Japanese Wind from the Sea expansion. In Japan, it was reprinted as one of the P Promotional cards as part of a McDonald's promotion that ran between May 25 and June 16, 2002.