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These are usually much more powerful than regular Pokmon, enabling their masters to thwart opponents

The question if it was ever intended to be included in packs is not completely clear, but the discovery of E4 member styluspt that the cards was actually advertised to be in the set in a Japanese Trainers Magazine as well as on early concept designs of Jungle booster packs certainly makes this appear likely (see PIKACHU 1ST ED JUNGLE BLACK STAR PROMO - WAS IT INTENTIONAL

You can see the remaining two of the loyal three below and their artworks as well

Perhaps if more powerful things like Beast Within and Swan Song are printed this will gain some more applications as you could trigger it yourself but that is so much phaff for such minor value