As Celebrations is such a small expansion ( 50 cards total , spread across two different collections), each booster pack only contains four cards , and one code to redeem on Pokemon TCG Online
either add 1 "Photon" or "Galaxy" card from your Deck to your hand, or send it to the GY
Among the Pokmon TCG Online content that wont be transferred to Pokmon TCG Live are cards from the HeartGold & SoulSilver Series, the tutorial starter pack cards from Pokmon TCG Online, avatar items and unopened avatar collection boxes, unopened products and bundles, your friends list, saved deck lists and in-game currency, including Trainer Tokens and Event Tickets
These are basically ways to give an ability that will go away if the creature leaves the battlefield
Spanning multiple seasons and spin-offs, the anime has kept marching on and so has the real-life card game along with it