WOTC Cards

[Rocket's Hitmonchan]

Are tournament decks limited to Nintendo issued cards?

For example, can I use a WOTC Pokemon card such as Pokemon Base set Hitmonchan 7/102 in States this year?

 

[PokePop]

Go to this list: http://pokegym.net/forums/showthread.php?t=41415

It outlines what old cards are legal to use in the Modified Format.
Hitmonchan is listed as legal because it was reprinted in the Stormfront set.