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Reason: Does Card Pop! work between different languages? (including between the English-Spanish-Italian and the English-German-French cartridges)
Is Card Pop! usable if any of the players is playing the Japanese version of the first game on the original Game Boy, the Game Boy Advance, SNES's Super Game Boy or Super Game Boy 2, or GameCube's Game Boy Player? (since the Game Boy Color infrared port is not required)
Does the second game (which is Japanese only) have built-in infrared or does it use the GBC infrared?
Are all cards available via Card Pop! or only some cards? (which cards exactly are available?)
How is it determined which card is given?
Is the player name used as the ID? For instance, is the player unable to use Card Pop! with two players with the same name or ID?.
When two games are connected via infrared, each player will receive a random card. A player cannot Card Pop! with the same partner save file again until both players have used the feature with fifteen others, causing their partner's ID is overwritten in both save files. If the save file is deleted, all Card Pop! data is deleted, so whether a new save file can Card Pop! with another game's save file is unaffected by the players the previous save file performed Card Pop! with.
Card Pop! cannot be performed between Pokémon Trading Card Game and Pokémon Card GB2: Here Comes Team GR!. Attempting to do so can result in glitches such as a game freeze or a loss of save data in Pokémon Trading Card Game.