What kind of Pokemon would be Time type? I can only think of Xatu, Celebi, Dialga, and Claydol, all of which already have 2 types. Also, I can think of several things that could be used to decide its Super and Not Very Effectives. Time in general is "Super Effective" against fire (doesn't last long), electricity (lightning lasts a very, very short amount of time, plus it does soon run out), fight(ers) (they don't live that long), and bugs (don't live long at all). It would be Not Very Effective against plants (many live for hundreds and hundreds of years), water (water lasts forever), dragon (dragons live for a loooong time), and poison (poison gets stronger as time goes on). It would be resistant to fire, lightning, and fighting. It would be weak to grass, dragon, and poison. I think that it would be immune to Time, because it could warp through/ see through time anyway, so it would not be very altered by time. Not sure if you want to listen to me or not, it's just my opinion.
EDIT: Your card's text is not exactly right. Try going here to try to get it right:
http://www.pokepedia.net/. search for Darkness Energy, copy it, then fill in with what is different for your card. Use the MT one, because there apparently was a text change.
Back to back posts merged. The following information has been added:
Here, try:
Time-Travel Energy can be attached only to an Evolved Pokemon. If the Pokemon Time-Travel Energy is attached to attacks, you may search your discard pile for a card and put it in your hand. If you do, discard Time-Travel Energy. Ignore this effect if the Pokemon that Time-Travel Energy is attached to isn't [T]. Time-Travel Energy provides [T] Energy. (Doesn't count as a basic Energy card.)