>>31361162the raritys of cards are Common, Uncommon, Rare, Ultra Rare, and Secret Rare. Secret Rare (SR) card numbers go over the count for the expansion. Like pic related is numbered 110 from a 108 card set.
SM is introducing another level of rarity called HR (not sure yet if that means Hidden Rare or more likely Hyper Rare), but they are even rarer prints of cards you can get in the set already. e.g. there will be three prints of Espeon-GX all in this set, and they all do the exact same thing, but some are rarer than others so will end up being worth more.
Check this page for what all cards in the set do:
http://bulbanews.bulbagarden.net/wiki/Collection_Sun,_Collection_Moon_leaked_onlineyou can see the rare prints at very bottom.
