A.f.a.i.k. all Portuguese Holofoil Rare cards from the HeartGold & SoulSilver set, as well as the Portuguese Umbreon XY96 promo (and English Trainer Kit Manaphy).
@Rockets_rares collects them, and has posted most of them in this same thread. To quote some of his posts:
EDIT: His IG contains a few more, including some cards from the Unleashed set, as well as the BW85 Lucario promo:
https://www.instagram.com/p/DAtmMS2PzrA/
https://www.instagram.com/p/DAvrkTmRjjC/
https://www.instagram.com/p/DAyzEP4vNBZ/
https://www.instagram.com/p/DA1BUV9vBs-/
https://www.instagram.com/p/DA3fEC1xYRa/
https://www.instagram.com/p/DA6LCoKPILA/
https://www.instagram.com/p/DBE8-coPJIB/
https://www.instagram.com/p/DBPi0pBvFKh/
Greetz,
Quuador