I'm a firm believer that in most cases, it's 2+ or nothing. There are of course good exceptions such as Town Map, but most of the time you'll want at least 2 copies of something important in your deck.
For decks that really used Catcher as a 4-of pre-errata (most decks, but especially Blastoise), a 2-of is preferable, but I could see a one-of being good as well for decks that don't need the catcher effect as awesome (i.e Darkrai).Eron said:Lysandre, I think it is pretty good when you need to catcher something and you don't want to rely on the flip.
Pipotchi said:I also run a single Sacred Ash in almost all of my decks because sometimes you just cant afford to save your pokemon in your hand until the next turn and just have to juniper them away.