Help with Eevee deck and make it tourney legal as of 2011?

EX cards are forbidden in tournaments as they are from an older set. Even some of your trainer and energy cards might be quite old and forbidden. Go to http://bulbapedia.bulbagarden.net/wiki/Modified_format_(TCG) as it shows you which cards are legal. So for example, your RR Jolteon can be used in tournaments because it's newer (made more recently). Your Flareon EX can't be used because EX cards are quite old (made some time ago). Basically, the newer the card, the longer it will be able to be used in tournaments. That link I gave you showed an explanation on what you were exactly confused about on the older sets. That is Pokemons version of a ban list. Usually not how good a card is, but how old it is. Hope this helped!