The Tyranids are basically a giant hive of insectoid monsters that roam around space eating things
In Pokmons case, when opting for a mulligan, you must reveal your hand to your opponent if no basic Pokmon are in it, shuffle it into the deck, and draw seven new cards from the top
However, Pokemon fans loved the idea and the card is still known and talked about to this day
Cheren also comments that he could've won if he'd had his regular team with him after you get your badge from him, confirming this idea even more
Centro Leaks previously told fans trading would be "disabled for rarer cards initially," so this latest update seems to only corroborate that: "'Pokemon TCG Pocket' will implement trading on January, however it will be disabled for rarer cards initially." Since launch, fans have been waiting to be able to swap the game's digital collectible cards with friends as players of the real-life trading card game have been doing for decades