As far as I know @woolsluk is indeed right about L1. I’ve seen the LEGENDARY 2-part cards a few times in unlimited edition, so I assume they are some kind of promo. None of the other L1 cards I’ve ever seen in unlimited edition though, and I seriously doubt they exist. But if you can find any prove, I’d love to know it (especially the Pikachu). 
As for the unlimited edition E1 cards, we have this thread. The 007/128 Ponyta was a magazine promo; the 082/128 Pichu was some kind of promo as well I think, although no one really knows how it was distributed. All the other non-holos were only given at certain tournaments and events in some Pokémon Centers in 2001, and very rare to find (I still need the Pikachu myself 
).
Greetz,
Quuador