Crystal beast mons concept funcards
Long story short, I eventually reached this yugioh funcard transcript :
The 6 pokémon heroes +Terapagos from pokémon horizon as
crystal beasts monsters in the yugioh tcg.
(monsters who, when destroyed are placed in Spell-trap zones)
And, for starter, I envisioned this concept of "crystal beast pendulum" for Terapagos and Rayquaza :
When destroyed, if placed in one of the pendulum spell-trap zones,
they (should) switch from monster to active pendulum card, natively.
Also, it transcribes, for Terapagos,
how it protects and awake dormant heroes,
to broadly sum up its role without spoiling too much.
(Also, Liko gets to connect to it through a heirloom pendant, ...
hence not far from the concept of straight-up "pendulum".)
For Rayquaza, it's a "blitz striker quickstarter"
Yet once it either show up to bring out heroes
or get summoned in a non-regular manner, it quickly fly away,
pushing the protagonists to go forward (thus, the drawing a card).
Original upload link for the funcards :
https://i.servimg.com/u/f20/16/97/75/61/terapa10.jpg
https://i.servimg.com/u/f20/16/97/75/61/rayqua10.jpg
PS :
The other 5 heroes are not done, but, as a guideline,
I would probably have the full team cover the set of 6 main yugi types,
with, at first draft :
Fire : Entei
Water : Lapras
Dark : Galarian Moltres
Light : Arboliva
Earth : Kleavor