Hi i read that dstwo has the worst compatibility of games than r4 is that true? Please help me decide between the two

DSTwo could play Pokemon b/w2 straight away when it first leaked, everyone else had to wait for patches
Really? Pretty sure my EDGE required a patched ROM to get it to run on my DS Lite. :\The EDGE card did that too, even the last update was in 6 / 4 / 2011

All modern flash carts can us the DS's online stuff.Can those flashcart connect to the met?