Shogun Gekomon

After you reach Volume Villa you will talk to ShogunGekom.

It will tell you to walk through the Misty Forest to meet Cherrymon.

But it actually holds another function. If you talk to the Geckomon to the right it will tell you that ShogunGeckomon collects cards and that opens up the card trading shop!

All infos about it you will get here:

Where do I get cards from?:

When your shop upgrades you will see a weird orange board to the left of the desk.

There is where you can buy cards.

You buy a card for 100 bits, but it is random based upon its worth, so grinding the cards requires quite some money (for that take a look at the money trick).

Some cards can be directly traded or acquired at the secret savanna shop that opens every year from the 1st till the 15th (you get "your card" as a unique card gifted there).

What are the cards worth?:

Cards will be traded in so called "Merit points" at ShogunGekomon and those points then in return can be traded into items! What can I buy from these Merit points?:

Source: https://www.supercheats.com/playstation/walkthroughs/digimonworld-walkthrough05.txt