The official Japanese Pokemon Twitter has revealed Lapras from the Golduck BREAK + Palkia-EX Battle Deck. Thanks goes to Ryah R. for the translation!
Lapras – Water – HP120
[W] Errand Running: Search your Deck for a Trainer card, reveal it to your opponent, and put it into your hand. Shuffle your deck afterwards.
[W][W][C] Water Spray: 80+ damage. Flip a coin. If heads, this attack does 20 more damage.
Weakness: Metal (x2)