May 11, 2016, 05:09 AM
Honestly, redeem any Pokemon Mystery Gift (even codes) you have "immediately" since those Pokemon will not go away as long as you have the wonder card on your MG section. Eventually all Mystery Gift/event/code Pokemon will expire but only if you don't happen to download the wonder card itself since that's going to trigger the event in the first place. However the only drawback to this is that you'll be stuck at soft resetting one Pokemon at a time but will still have the event Pokemon in tact. Good luck soft resetting though!