"Special Energies have names on them and writing on them.
Basic Energies don't have anything but the word ENERGY at the top.
Basic Energies are Fire, Fighting, Grass Water, Psychic, and Lighting.
All the rest are special Energies"
well your almost right
basic energy CARDS- just have the word energy at the top (there are currently
only fire, water,grass,physic,electric,fighting) there could
be dark and steel of these, however they are not printed
yet, just picture a card with a big dark symbole on the
frount with the word DARK in the tital and thats ALL it
would be (same for steel) but these are NOT PRINTED YET
special energy CARDS- these are the cards with all the text (ie full heal boost, warp and so on) there are dark and steel SPECIAL ENERGY cards (the ones we are famililar with) theoreticly they could print a special energy fire card that did some wacky thing, they could so this for every basic energy TYPE.
basic ENERGY- this is all those little energy symoles we see these have nothing to do with weither or not there is a card printed for them or not the current basic energy types are as follows: fire, water, grass, physic, electric, fighting, dark and steel. dark and steel are basic ENERGY types.
so....................
crystal energy CANT privide a dark or steel becuase the text sayes chose a basic energy CARD attached to the same pokemon, and since there are no BASIC ENERGY CARDS of dark or steel yet.....you cant chose something that does not exist.