Originally Posted by SpacePirate Ridley
I was thinking of buying it until I read this:
Is this important during the game?
Playing as many matches as possible is the best way to gain access to new training cards, and as you progress through the leagues you notice that new challenges are offered which allow you to track down new and unique cards. For example, it's possible but entirely optional to play practice games against Focused Training Teams and Challenge Teams when you move to the Advanced league, and these meetings offer the chance to bolster your team in specific areas you feel they need work. To play these special sides you'll need to dig deep, however they are locked away behind a paywall and require an in-app purchase to access. Fans of FIFA's "Ultimate Team" mode will know all too well about frittering away precious cash on virtual goods, but casual users may find the experience rather exploitative, given Nintendo Pocket Football Club's already high price tag in relation to other 3DS eShop offerings.
It sounds like it's an optional challenge mode to get new training cards to upgrade your players, but you might be able to obtain those cards through normal play - it sounds like in the Advanced League, you can play friendlies to get cards instead of proper games but you have to pay to do so.
Edit: Never mind, the teams are special so they're probably different to the normal season mode.