Never participated in an online tournament. *shrug*
So the GTS Global Mission has gone online, and details are as follows:
To beat the Mission, over 1,000,000 Pokémon need to be traded. This Mission will end on 14th Feb 2017 23:59 UTC.
Rewards are 2,000 FC if successful, 200 FC if failure. If the game is tied to a Global Link account, then it's 4,000 FC if successful, 400 FC if failure. Additionally, if you manage to make 5 or more trades on the GTS during the Mission, you will receive a Rare Candy and if a total of 2,000,000 Pokémon are traded, then all participants get a Friend Ball.
Argh... GTS huh...