Once all those blocking creatures are assigned lethal damage, any remaining damage is assigned as its controller chooses among those blocking creatures and the player or planeswalker the creature is attacking
Remember, fake Pokemon cards are worthless, so even if a scammer takes a loss, they still profit from ripping you off
Example some Uncommon cards were printed 4x on each Uncommon sheet, like Oasis
Here are some of mine: Omanyte(Legend Maker): Hippopotas(Ultra Prism): Scraggy(Dark Explorers): I was lucky enough to get that omanyte reverse in my only legend maker pack opening
This means that you can have only one in your deck, but more importantly, you can only have one of them attached to only one of your Pokmon
There are many online resources that can help you determine the value of your cards