DMA is a different kind of flashing in order to "play" the rom
GTS is global trade section used by WiFi, it has nothing to do with Akaio, it is a feature in the pokemon games, not in Akaio`s or acekards firmware (unless you recall the wifi compablity of the card)
Pokemon Platinum (U) should work just fine for you without DMA patching, if it doesn`t use the same version I use and I can promise you no trouble
I use the version downloaded from www.romulation.net