More might have been added by now, but to quote a post of @slowqueen from mid-2025 regarding holo variants for the Slow evo-line:
In general, unique holofoil patterns could be found for the following languages (skipping English/Japanese on purpose):
- S. Chinese (this one has the most unique holofoil variants, mostly different type of reverse holos)
- There are some unique holos in the Korean Shiny Collection set (here an example)
- Portuguese saturn holos, commonly found on holos during the HGSS era
- French McDonald’s Reverse Holos for some SM+ era French exclusive McDonald’s sets
And then there are of course existing holofoil variants that differ per language, which are kinda all over the place for promos especially. E.g. the French-exclusive McDonald’s holos you mentioned earlier; the BW54 Pikachu promo is non-holo in English, but Cosmos holo in Italian; the French POP9 Pikachu is Cosmos holo, but non-holo in other languages; etc. etc.
As for unique stamps, those can be found on most of the Asian languages, not just Japanese. There are some unique stamps for Korean, Thai, Indonesian and T. Chinese cards.
If there are any for the Slow evo-line specifically, I’ll leave for @slowqueen to answer. 
Greetz,
Quuador