There are rules which allow the appropriate authority to punish teams which do not play to their fullest ability (obviously these have not applied in the World Cup Finals situations which have happened in the past). The 'big' clubs do put out reserve squads in Cup competitions against lesser opposition. I'm sure they don't intend to lose the matches, but they have been handed a few bloody noses over the years...
If there have been occasions where teams have deliberately lost, they haven't been as overt tactically as the tanking methods employed by T11 managers...
Any formation or tactics advice given is based purely on experience with my teams...
The word is not allowed, but does some teams lose on purpose? Well they do, some nacional, regional and even local rivalry can make teams put weaker players on field so the other team gets in a better position on the league and not the rival team. Something like this, if you lose the game, your rival wins the championship but if you let the other team win, your rival wont win the championshiop that turn or it can be delayed.
Edit: of course they fake to look like a 'normal' game.![]()