M Latios EX is a pretty nice card and I would love to use it but the problem is the fact that you need to discard energy after using the attack. With all the Shaymin EX running around, it is tempting to snipe them off using M Latios EX. I guess it needs a bit more play testing and some fancy Mega Turbo to get it going. You will need to tell me how you been playing it for I can get a good idea on how to properly use M Latios EX.

It does seem that Pokemon is trying to have some control on the second hand market and making the game somewhat easy to get into. Especially with what is getting Tin Promos. They were really good at price control during the BW days with the Mewtwo-Rayquaza-Darkrai and Plasma Tins. Even the Xerenas EX and Yvetal EX got their own tins after being out for just a short time. Maybe Shaymin EX will get a tin in the future. Either that or M Latios EX is going to see some big play soon.

I did saw/heard that Trevenant got some play at Nationals. It didn't make it to the Top 8 but there was a lot of it there. It saw a good use in Gengar EX decks who would use Dark Corridor and then swap to Trevenant to put an item lock up. It was really annoying to face but as you said, it doesn't have a lot of HP. Once I had power up an Aegislash EX and was able to get Keldeo EX with a Float Stone, then the deck became easier to handle as Aegislash EX literally sliced though Trevenant.