what if my mom disconnects my router when my friend is losing?New Rule since it wasn't listed yet:
If we have a reason to believe you forfeited a game to boost a friend's account, you will be sanctionned.
Example: http://replay.pokemonshowdown.com/ou-261742823
Since the rule wasn't in effect before this particular battle, sanctions won't be taken, but at least the loophole will be fixed from now on.