Virtual packs
A simulated booster, built from the cards that set really contains. No money, no real cards, nothing to buy.
5 card anniversary pack
Pick a set and rip it open. Cards are drawn from that set's real rarity mix, with the pack layout that era actually used, so a 1999 pack gives you eleven cards and a modern one gives you ten.
Best pulls
Nothing yet. Open a pack and you might be top of it.
Odds are an approximation. The Pokémon Company does not publish pull rates, so slots follow the pack layout of that era and the chances are weighted from the rarities the set actually has.