pokemon card expansion 151 Booster Box (Japanese) The display contains 30 Booster packs Pokemon Card Game MEGA Expansion

Its also worth noting that these arent the same as the Mystery Booster -style playtest cards released years later

The God Pack mechanic (all 10 cards in one pack can be rare) has no Pocket equivalent

A dev team that doesn't want to bother having to test the cards for a side set, no really the main reason bad cards are printed is that they don't have the resources to test the meta impact of 60-170 new cards they're releasing every month

Although this three-month window is a fairly long one, it's worth noting that players were only able to obtain one copy of the card, meaning its population is likely incredibly low when compared to some of the other rare Pokemon TCG Pocket promo cards