Well, from my standards of "RTS" I would have to sadly say the only one I witnessed would be
Lego Battles
lolol
Harvest Resources
Build up a base
Raise an army
Destroy the enemy base
(not a turned base game for those who get that crap mixed up)
Even has a Skirmish mode where you can 1v1 freeplay against the Comp
or you can challenge friends through wireless multiplayer
Even has a huge story line, with multiple missions, can get a hero that has the ability to caste spells
Probably would be the only
DS game I can classify as RTS and it is a childs game played by my little nephew :D lol
Come on
DS, make some RTS games similar to this for people who dont want to play with legos anymore!