I don't have the game, although I recently read about an undesirable Double Battle glitch where if the player is forced to send out two Pokémon, though only one Pokémon is available to send out on to the field, the game will ask the player to send out two Pokémon, though since only one Pokémon is available, the battle can no longer be continued after the game asks the player to send out the second Pokémon.For example, say you enter the Battle Subway - Doubles (which uses four Pokémon):
Turn 1: Player sends out Pkmn1 and Pkmn2, Pkmn2 attacks Pkmn1 and faints it.
Turn 2: Pkmn2 survives the opponent's attacks and player sends out Pkmn3.
Turn 3: Pkmn2, outrunning Pkmn3 uses Explosion, fainting itself and Pkmn3, the opponent attacks and the usual "But there was no target..." message is given.
Turn 4: The player is left with one Pokémon, though the game still asks for two Pokémon so the player cannot proceed after the game asks the player to send out a second Pokémon.
I'm not sure if this has since been fixed in (perhaps a later version), though to say the least it might hinder some competitive battlers.http://www.youtube.com/watch?v=QVNMqvz9SwYEdit: Never mind; apparently you have to replace a Pokémon that just fainted with the one you're sending out, by selecting the last Pokémon first and then the fainted Pokémon.