OK there a 4 save methods:
password/no save at all
EEPROM, cheap nasty and small. Used for high scores and such on simple games, albeit about half of the available titles.
SRAM, some are battery backed while others use a slightly different route apparently, used on mid range games and the more simple RPGs/platformers/
Flash, complex games and RPGs here.
Cheapest way of grabbing saves would probably be to buy a linker for a flash cart (normally less than £15) and use that or use that save grabbing tool I linked in conjunction with a GBA slot cart (I hear the SC does not like it though as pulling it out resets the console).