It's easy to guess the Pokemon TCG's most prolific cards of all time. You've got your Pikachu, your Charizard, your Eevee. Of course, they have the benefit of being from Kanto, and thus, around the longest, but it's still testament to their popularity worldwide. More recent Trading Card Game favorites include Morpeko and Urshifu.

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But what about the least represented Pokemon in the TCG? Many of us are familiar with the lawsuit that kept Kadabra from getting new cards until recently (and even then, at the time of writing, we still haven't seen a new one). But Kadabra had five cards before that went down. No, we're talking about the Pokemon with two cards or even just one. Some of these may surprise you.

As the eighth-generation mainline games, Sword & Shield, are still relatively new, we have elected not to include them. It's just too early to take their rarity as anything more than a temporal matter.

One last thing: since this is a ranking list with technically just two possible answers (only one card exists, or only a couple instead), we're counting down from the newest game generations to the earliest, since seeing older Pokemon (with a longer period of time to be given new cards) with fewer representatives is simply more surprising.

10 Brionne (Sun & Moon Era)

Brionne TCG Pokemon

Right off the bat, we should probably clarify something — we're only counting completely new cards, rather than reprints, minor variants, and so forth. This just isn't an interesting topic if we look at, say, every background color variation that Eternatus has received to-date.

With that out of the way, poor Brionne, right? Everyone knows middle evolutions get less love, and sure, Sun & Moon is as recent an era as we're looking at here. But still. It's part of a starter line! And it sings! And it's... blue? Okay, so it's not the most popular Pokemon, but the point mostly stands.

9 Comfey (Sun & Moon Era)

Comfey TCG Pokemon

Until quite recently, Comfey belonged to the tiny group of Pokemon with a single card. Evidently, The Pokemon Company International suddenly remembered it exists. Comfey is modeled after a Hawaiian lei, which is neat and all, but also one of those instances wherein Game Freak figured a circular object (see also Klefki) would be adorable. Mileage varies, but we don't see Comfey talked about pretty much ever. So, that didn't work.

Lost Origin, the penultimate expansion for Sword & Shield, brings back the long-abandoned Lost Zone mechanic. Unlike going to the discard pile, any card headed for the Lost Zone is removed from play entirely. This makes the newer Comfey's ability, 'Flower Selecting', one of the biggest high-risk, high-reward cards in standard rotation.

8 Minior (Sun & Moon Era)

Minior TCG Pokemon

Minior makes more sense, at least. We like its cosmic appeal (and check out that attack on the version we chose for our picture, geez) but having only two cards in the TCG right now isn't terribly surprising. We'd wager it's far from the upper echelons of fan nostalgia when folks look back at the Alolan Pokedex, and that kind of stuff often translates to what The Pokemon Company International does with its card game

7 Stakataka (Sun & Moon Era)

Stakataka TCG Pokemon

Is Stakataka one of the tallest lads in Pokemon? Definitely. Is it the tallest? Not even close, actually. This Ultra Beast is the result of multiple stone-made creatures bound together, which is an interesting twist on the typical species formula, but has it caught on in the eyes of the fandom?

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Well, not enough for more than two cards. In general, the Ultra Beasts are a rather divisive bunch, and Stakataka's no exception. At least Stakataka-GX is pretty strong relative to other cards from its time, even if most VMAX and VSTAR Pokemon from Sword & Shield's expansions would have it for breakfast. So it goes.

6 Nihilego (Sun & Moon Era)

Nihilego TCG Pokemon

Our last two-card representative of the Sun & Moon TCG era has what may be the edgiest name in franchise history. Nihilego. Just say it aloud a few times and try not to think of Shadow the Hedgehog or something. This Ultra Beast, codenamed UB-01 Symbiont, because that's totally relevant, has the rather nifty Rock/Poison dual typing in the games.

In the card game, it's stuck with Psychic, but then, it's hardly the only Poison-type friend who has made the jump to that category. The TCG consists of fewer types than the franchise's other forms, which stands to reason, as overloading it with 17 varieties would be hellish.

5 Amaura (X & Y Era)

Amaura TCG Pokemon

Generally speaking, Fossil Pokemon get the short end of the Trading Card Game appearance stick. Since we're sticking with species cursed with only one or two cards, you won't see it as much, but expand your horizons slightly, and there are a plethora of three-card prehistoric pals.

What makes Amaura even lonelier is that its evolution, Aurorus, is part of that group, whereas poor Amaura is stuck with two. Courtesy of an Aurorus-EX card, the larger icy (or in the TCG's case, watery) sauropod is the more plentiful of the pair.

4 Tyrunt (X & Y Era)

Tyrunt TCG Pokemon

Remember ten seconds ago, when we mourned Fossil Pokemon? Yep, the X & Y era's other first-stage ill-fated friend is none other than Tyrunt. The theropod with a hunchback and a bad temper follows Amaura's lead to a tee, with a three-card evolution in Tyrantrum courtesy of, you guessed it, a Tyrantrum-EX. Is this an 'us' thing? Or are Kalos' dinosaur reps far more popular than the makers of the trading cards seem to think?

3 Budew (Diamond & Pearl Era)

Budew TCG Pokemon

Now this one surprised us. Budew is from the Diamond & Pearl days. Sinnoh has been around the proverbial block more than a few times. And in yet another case of basic Pokemon somehow getting shafted in favor of a greater number of cards for their evolutions, Roselia vastly outnumbers Budew. Plus, being Grass-type, one would be forgiven for assuming both cards match the role. Instead, there's one instance of Grass and one of Psychic instead.

Well, we suppose there's room to say that makes Budew cooler, if weirder. If you're going to be forgotten by the TCG, at least do it in style.

2 Bonsly (Diamond & Pearl Era)

Bonsly TCG Pokemon

And so we have arrived at the dreaded duo, the only two Pokemon up through the Sun & Moon phase who have seen but one card in the history of the TCG. Strangely enough, both are from the Diamond & Pearl era. Bonsly does have something substantial going against it, though — baby Pokemon are infamously underrepresented. Frankly, it's a rare thing to find anyone who cares much; the baby mechanic wasn't exactly met with open arms back when it was introduced in Pokemon Gold & Silver.

Even so, there's something distinctly depressing about Bonsly's evolved form, Sudowoodo, having 14 cards by comparison. Alas, poor Bonsly; we barely knew ye.

1 Mantyke (Diamond & Pearl Era)

Mantyke TCG Pokemon

Even in its debut, Mantyke was... not a good card. 'Call for Friends' couldn't accomplish much during Mantyke's sole moment to shine, though ironically, it could be argued that in today's world of technically 'Basic' Pokemon V, it might fare better.

This statement's old hat at this point, but Mantyke's evolution, Mantine, features in a dozen cards, leaving its baby form behind possibly forever. Who will mourn poor Mantyke? Admit it: you'll forget it exists five minutes after closing this article.

Next: Pokemon TCG: The Pokemon With The Most Cards