Yes, if you sold your card (like say, a Brobot card), you should be able to buy it back at the flopside card shop. However, they might not appear in the list of cards he offers you at first; this is because his inventory is largely random and you might have to go in and outside of Flopside a few times to get him to show the right inventory.
Yes.
None other than Count Bleck.
no. you get it when you beat the dark heroes at the end of the flopside pit of 100 trials.
It doubles Bowser's attack power
You don't.
All characters in Super Paper Mario have cards, but only enemy cards have any effect. Cards for main characters have no practical purpose beyond being collectible.
Try looking on the back of the "New Super Mario Bros." card.
In Flipside, if you have Boomer, go to the right and blow it up to make a hole in the wall. Flip to 3D and go through and to the left is the card shop.
You have to beat Flipside's Pit of 100 Trial twice to get a Mario card, which allows you to have unlimited 3D.
Either buy it at the card shop or get it at a regular shop for 300 shop points
go to chapter 1-1 near the star block flip 3d you will see a trail on the left walk in it then you will see a tiny box open it and you will get a goomba card or just buy it at the card shop
There is none.