I agree with both of you. Personally I don’t think any UED Base Expansion Packs even exist. I’ve only seen pictures of the Ponyta, Charizard and Pichu non-holos promos here on the forum, and rumors of the Alakazam, but I’ve never seen any other. Apart from those fake pictures from the same YJ seller who lists 1st with UED pictures (not only for the Base Expansion, but he did the same for Skyridge which I bought once without looking at his description).
The UED World Championship packs are indeed pretty rare as well, although I do have the Pikachu (still looking for the Seviper, though).
As for L1-L3 UED, I have yet to find any sign of the Pikachu and Pikachu Reverse Holo… The only one I see pretty regularly are those Legend pairs of two. I’ve seen multiple of those in UED, although they aren’t less desirable. I know @tonysandlin has been able to find the Voltorb and Electrode for his collection (although he’s still looking for the Reverse Holo ones), and @supersaiyanampharos currently collects them and has a few (how many do you have now?)
Although the opposite is true for English sets, Japanese cards in UED are in almost all cases much rarer than 1st edition. (The only exception are the Theme Decks, where the 1st edition is usually rarer than the UED. I have yet to find a 1st edition Pikachu from the Raichu Starter Deck. Although I’m not 100% sure it exists, as with a lot of the Pikachus I have yet to find and haven’t even seen a single picture of yet…)
Greetz,
Quuador