japenese booster box Base Set Pokemon Japanese No Rarity Potential No Bottom Print 30 booster packs per booster box 5 cards per booster pack The ranks of Ancient and Future Pokémon continue to grow Japanese Pokemon Cyber Judge Booster

Yes they were regular, legal cards in their era, though each carried the printed rule that a deck could include only one Pokmon

Barrow Naughty Bitterbloom Bearer Bitterblossom Blightwing Bandit Bog Naughty Dream Seizer Dream Spoilers Dreamspoiler Witches Eye Collector Faerie Bladecrafter Faerie Dreamthief Faerie Macabre Faerie Tauntings Final-Sting Faerie Flitting Guerrilla High Fae Negotiator Marsh Flitter Nectar Faerie Nettling Nuisance Nightmare Sower Nightshade Schemers Nightshade Stinger Old Flitterfang Oona's Blackguard Oona's Prowler Peppersmoke Prickle Faeries Puppeteer Clique Rankle, Master of Pranks Spellscorn Coven Stingblade Assassin Thieving Sprite Violet Pall

That is, someone had to figure what each card was, and back then, also write the art description for the card

Replacement effects, such as a permanent entering the battlefield tapped or with counters on it, are unaffected