At first glance, all the cards that exist in the Pokmon card game universe are perfectly legal to play in tournaments
Just want to take a moment to call out one of the most busted sideboard color hosers of all-time, Dystopia
The second (and more dangerous) way you can be disrupted is if your resources run too low, and your hand and deck combined have 6 or fewer cards in them, causing you to deck out
The second style of group hug is what I call irresponsible group hug
Basic lands come in six types, with each of the six producing a different type of mana when tapped: Plains produce white mana, Islands produce blue, Swamps produce black, Mountains produce red, Forests produce green, and Wastes produce colourless (and are much, much less common than the other five, having only appeared in one set)