In ascending order you would walk through Japanese, then Chinese, then Korean and Russian in terms of scarcity and value for US collectors
The retreating Pokemon keeps all their attached cards and damage
After unlocking it through the Mystery Gift feature, players could encounter the Dark-type Mythical on New Moon Island after using the Member Card item
Pokemon Communication (Item / Space-Time Smackdown) Swap a Pokemon card in your hand for another random Pokemon card
You could run the Food and Fellowship deck and play with Frodo and Sam, or maybe the Riders of Rohan with owyn instead
Caustic Bronco: Could have been Dark Confidant on steroids, but mediocre thoughness and no evasion keeps its attack trigger from being reliable Calamity, Galloping Inferno: somehow just a normal horse, not Elemental or anything