Pokémon is a huge game. I'm not sure if you'll be able to backup it right in a 4 GB SD card. Couldn't you get an 8 GB one? That would solve the problem for now.
Right now you could try dumping Mario Kart, A Link Between Worlds or Majora's Mask. Those don't have as many tutorials as Pokémon editing, but there are some threads which talk about their editing. And they use less space than Pokémon.
It's kind of big, it uses around 2 GB with updates and so. But if you dump the original version, it will use around 1.5 GB in your SD card. You could try giving it a try after cleaning enough space.
No, you don't need to delete them. I'm not completely sure, but it seems the game gets dumped without updates, even if you have them installed. No need to erase them.
You can try to add the exefs from the updates to the romfs so you load a fully updated Smash from HANS, but that's really hard. I tried myself, and I coudn't get anything to work. You could check comments on the thread about custom music on Smash.
No. I read about some method to put the update inside romfs so the game starts as if it loaded the updates. But it was more an idea based on using something similar to NTR's CFW layeredFS plugin.
I mean I was able to play my Smash bros cartridge on HANS without deleting my save file or having the update
That works if you have a 1.0 version save in your cartridge. Having saved with an update in another console, would prompt you to install the needed updates, since HANS doesn't find them.
