Pinsir could be a solid Zard killer if it ever comes back in full force.
Sudowoodo has a funny secondary attack, but basics with 1 energy retreat locks can have their uses. Look at LOR Mawile
Looks overall fine for the archetype they're a part of. Silicobra can find Postwick for others in the Hop set, while Sandaconda has a 1 energy (with choice band) retreat lock in a post Blocklax meta that can hit up to 120 damage with the full combo meal. There's definitely better choices for...
330 is a wild number to hit against some of the most popular pokemon in the format, like Zard and Pult. Any deck with good universal acceleration will benefit, though the post rotation pickings are slim (maybe Baxcalibur).
Secret box has allowed some extreme late game reversals in some games I've played, and finding necessary components earlier is extra helpful. I can't see Secret Box fading at least until Pokestop rotates, but even then Lively Stadium can assist in making the swarm of Roaring Moon even tougher to...
It's funny that one earthen vessel has more value than the squawkabillies combined, and as a pair probably account for roughly ~20% of the product's cost (price source cardmarket)
Earthern Vessel is a great inclusion, could always use more of them in circulation. The only oddity I can see is the few 1-ofs, namely the Booster Capsules and Explorer's guidance (also super rod but that's usually a one-of anyway). The decks that use those archetypes want a good amount of them...
Klefki has the same effects against basics. Needing to be active isn't even a big deal since it acts as a good buffer in the early turns when setup is paramount, requiring an early boss to break since Bundle is shut off by it, denying either basic abilities or a turn 1/2 setup supporter is...
It also affects Archeops, since Fossils are technically basics. Considering Lugia won Joinville, that's also a pretty big deal. I can see Gastrodon being seriously popular as a tech.
Why is Boss's rotation even being discussed? Ghetsis got a print in the G block, and Prime Catcher is in H. The effect isn't going anywhere for at least a couple years.
The target demo for this doesn't seem to be hardcore Pokémon fans, but rather the friends/family of said fans with limited franchise knowledge to get as a gift. It's pretty fine in that context, but anyone who's shopping for themselves should probably just get what they want to get.
I was gonna say the lack of Radiant Zard is strange, but then I remembered rotation exists. All in all though, pretty solid (hell, the deck costs about as much as prime catcher goes for as of writing)
Looks handy to make your opponent scramble, but it's not as lethal as Unfair Stamp or the many disruptive supporters. A new hand could even save your opponent, and then there's the case if they're running a draw heavy deck like Gholdengo or Gardevoir.