The wording of Fighting Stadium is now as follows, "The attacks of each {F} Pokémon in play (both yours and your opponent's) do 20 more damage to the opponent's Active Pokémon if it is a Pokémon-EX (before applying Weakness and Resistance)." This stadium should only impact the Active Pokémon-EX belonging to the opponent of the attacking Pokémon.
Source: TPCi Announcement (2014-11-18), TPCi Rules Team (2014-11-20)

Relevant cards

Note: All applicable cards may not be listed below.
XY3_90