AbilityBoom Boom Groove
Once during your turn, if your Active Pokémon has the Festival Lead Ability, you may search your deck for a card and put it into your hand. Then, shuffle your deck.
Scarlet & Violet Black Star Promos

Thwackey is Pokédex #811, generation 8 (Galar). Thwackey is a Stage 1 Grass Pokémon with 100 HP. The card says it evolves from Grookey. In this catalog that name is Grookey (#810). The card lists Rillaboom, Rillaboom (#812) under evolves to.
Thwackey sits at 115/102 in Scarlet & Violet Black Star Promos, position 115 of 165. Before it is 114 Picnicker, and after it is 116 Infernape. The set belongs to the Scarlet & Violet series. It was released on January 1, 2023. The printed size is 102. This checklist is longer, at 165 cards. The collector number is above the printed set size of 102. The listed rarity is Promo.
Boom Boom Groove is listed as Ability. Once during your turn, if your Active Pokémon has the Festival Lead Ability, you may search your deck for a card and put it into your hand. Then, shuffle your deck. The attack Beat lists 50 damage. The cost is Grass, Grass. Weakness is Fire ×2. Retreat cost is 2. The flavor text reads "The faster a Thwackey can beat out a rhythm with its two sticks, the more respect it wins from its peers." The regulation mark is H.
Thwackey (#811) has 6 other cards in the catalog. Those other cards are in 5 sets. The other printings with a release date run from 2020 to 2024. The earliest other card is Thwackey 12/202 in Sword & Shield (2020). Both list 100 HP. The rarity there is Uncommon, and here it is Promo. Megumi Mizutani illustrated that card, and Uninori illustrated this one. The regulation mark there is D, and here it is H. 2 other cards of Thwackey list a different HP.
The illustrator line reads Uninori. I count 12 other cards in the catalog with that illustrator.
Scarlet & Violet Black Star Promos set binder is where a full Scarlet & Violet Black Star Promos set goes. This card fills one slot there. A generation binder holds one card of each species. Thwackey can fill a slot in Generation 8 binder (Galar). I still need this card.
Once during your turn, if your Active Pokémon has the Festival Lead Ability, you may search your deck for a card and put it into your hand. Then, shuffle your deck.
The faster a Thwackey can beat out a rhythm with its two sticks, the more respect it wins from its peers.
Scarlet & Violet Black Star Promos, in the Scarlet & Violet series. It was released on January 1, 2023. The printed size is 102.
115/102. It is entry 115 of 165 in this checklist.
Uninori. The catalog lists 12 other cards with that illustrator.
Promo.
Thwackey #811, generation 8 (Galar).
H.
Beat (50).