You can find the full checklist and images on sites like Serebii.net (source: ) and Cardmarket (source: )
But theres no obvious requirement for these to come in the form of lock cards
Elesh Norn, Mother of Machines - $170.10 Version: (Borderless) + (Step-and-Compleat Foil) Probably not coming as a surprise to many people, the new Elesh Norn is quite high on the list and has the number two spot by a great margin
Mix in cards that benefit you when they get tapped like Fallowsage along with ways to untap your board like Village Bell-Ringer and we've got an exciting new Tokens that that can utilizes weird niche cards for some truly explosive turns
Its Skull Bash is a bit too expensive for how weak it is, but this is a standard Basic Pokmon from Stellar Crown , so what truly gives it value is its rarity and heartwarming illustration of a Gen 1 Pokmon
Rare Holos and Reverse Rares Rare Holographic cards used to be the rarest Pokemon Cards you could pull from a set, especially for the older sets like Base Set and Jungle Set