There is some variance in shape, but it's pretty obvious that it is supposed to be a triangle, full circle, or even an acorn
I want to say they were literally called Rainbow Rares image400558 62.3 KB In the Sword and Shield era, VMAXes with special arts were in the same rarity category as the Rainbow Rare (English)/HR (Japanese) example: Umbreon VMAX HR(Hyper Rare/Rainbow Rare) SA (Special Art) image436599 58.3 KB Special Arts (IR/SIR/Alt Arts/Alts/etc) Illustration Rare (unique illustration, no texture) Japan designation: AR (art rare) image430599 40.6 KB image250250 2.18 KB Special Illustration Rare (unique llustration, textured) Japan designation: SAR (super art rare) image430599 43.4 KB image250250 2.31 KB Note on SAR/IR the SAR/IR rarity was created in the last set of Generation 8
Pokmon TCG Pocket comes pretty close to emulating the feel of the full Pokmon TCG , but it makes some smart exclusions that help streamline the experience
Now, even with this latest reveal, theres still lots to ponder
For years, people wanted Charizard to be a Dragon