Don't get stuck on the RMT thing. Refresh Latias works exactly like SubCM Latias, but she has the pro of beating Chansey and Blissey and the ability to switch easier to some special attackers that she walls, such as Rotom-W and Celebi. But it is a really minor thing that makes it different from the standard set (not that Refrsh is not standard). And as you know very well, most good players know very well CM Latias's value, and this value won't change if you give it Refresh.