In Expanded play, Jirachi-EX is critical to pulling off Archie's Ace in the Hole / Maxie's Hidden Ball trick early and consistently. "Archie's Blastoise" decks typically run two, in addition to the Battle Compressors, Trainer's Mail, Ultra Ball and Acro Bike mentioned. It's a shame Jirachi-EX isn't available in standard, because its Ability lets you search your deck for a Supporter when you play it to your Bench. That means that if your hand consists of an Ultra Ball and any other two cards, you instantly have access to Archie so long as there's a valid Pokemon your Discard Pile and two empty spots on your Bench (one for Jirachi-EX, one for the Pokemon you're putting into play with Archie).