pokemon 151 cards buy English | Scarlet & Violet | This booster box contains 20 booster packs Each booster pack contains 7 cards All cards are Japanese This concerns a sealed case containing 12 boxes. Pokémon TCG: 151 Binder Collection

Looking into the cards description for help, we learn that flash is about putting a creature in play in an instant, likely when its not expected

Let's get to it shall we

At the start of combat on your turn, you can use Tidus to move a counter from a creature you control to a second creature you control maybe an Indestructible counter or a +1/+1 counter

(It can't be the target of spells or abilities.) : Enchanted creature gets +1/-1 or -1/+1 until end of turn

Its a great casual card too, so I think the price will stay elevated for a while

Yes, you can run lessons in the main deck , where they'll function as a regular instant or sorcery