OK i recently got a edge ds cartridge that came with an inbuilt action replay but i don't seem to get these cheats on any of my games and i don't know why Ive tried putting on new cheat databases but its still doesn't work my guess is it has something to do with the names of the Roms but if so how do i fix this please help.
See if there's some sort of database file amongst your firmware files, like a .dat, .0, .xml,.txt etc.
you have download some special stuff from the website (specifically cheat editor) and your own action replay cheats of the internet.
Usually a database editor like the R4 one which doesn't have to be used just for R4's database file. I think the database from http://cheats.gbatemp.net/ will work on EDGE.