You just missed it because you'll never see it in a deck
it's understandable that you don't know of this card, as it's pretty terrible in my opinion. i always forget that it's in my collection, and then i stumble upon it putting away other cards.
is it just me, or are legendary pokemon often not given cards that live up to their abilities?
...Regigigas?.
there's one card, Kadabra.
I Always wondered why they didn't make kadabra...
google up "Evil Geller" (Japanese name for Dark Kadabra) and you'll see why.
We're still missing Sheimin (should have arrived by now, probably next set) and Arecus (...No idea when that's coming), as well as the new Rotom forms, but other then those exceptions, everything's been printed.