Because hes full up with orders wait a few days and you will be able to use it again.
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There are two times where you can't use the catologue: 1. When you have a visitor from another town and 2. when you already baught something from the catologue in the same day.
For just 1 ROBLOX game, you have to use a free model or have some decent scripting skills. For just games that allow gears, you can buy on at the catalog but most cost lots of ROBUX.
Most use a free model from the catalog
In Pokémon FireRed, for defeating Brock, his Badge will allow you the use of the Flash HM, Misty's Badge will allow you to use the Cut HM, Lt. Surge's Badge will allow you the use of the Fly HM, Erika's Badge will allow you the use of the Strength HM and Koga's Badge will allow you the use of the Surf HM.
Before Herbert's Revenge mission, you could buy the goggles in the F.I.S.H catalog. And I think they show up every once in a while in the clothing catalog. Otherwise, you can use the lantern to light your way. You have to be a member to use the goggles.