They don't lose any loyalty counters or abilities, and you can still activate their loyalty abilities if you haven't done so yet this turn
As noted by Patrick Metzger in an article for The Patterning, it generally takes about 30 years for a critical mass of people who were consumers of culture to turn to the art and culture that helped them achieve comfort and clarity in their world. More importantly, creators will indulge in the new nostalgic trend thats being repurposed in an attempt to revive that same zeitgeist. Its part of the reason why the 1950s were big in 1980s America, why the 1980s were big in the 2010s, and its almost certainly part of the reason were seeing Pokmon re-emerge in such a big way now
Discard 2 Energy from this Pokmon
This almost feels like an auto-include in landfall decks
But it has flying, and, more importantly, you make your opponents lose life when you put their stuff into play
Set Boosters will contain 12 Magic: The Gathering cards, an Art Card, and a token/ad card, Helper card, or card from The List (found in 25% of packs)