Looking at the EARTH pool that can Synchro, most of them probably wouldn't mind either way if the requirements were switched.
WHAT'S THE DECK DO?' This deck is from Gavin Verhey's secret vault, and it's a blast to play
In the post I do indicate that Carddass is the first official release and indicate my stance that TopSun is first refers to unofficial information from collectors the likes of Gary & EB (that discussion is linked in the TopSun resources)
The most relevant cards in this set include: Houndoom EX, Octillery, Magnezone, Mewtwo EX, Mega Mewtwo Y EX, Gallade, Zoroark BREAK, Brigette, Fisherman, Float Stone, Heavy Ball, Parallel City, Super Rod, Skyla, Town Map, Rainbow Energy With Pokemon XY BreakTrough Codes You can get the Following Over 160 cards 6 new Pokmon BREAK featuring a brand-new game mechanic 8 new Pokmon-EX, including 4 Mega Evolution Pokmon
"The 20 best Pokmon cards of all time, ranked"