I think Blaziken has potential to be a good gym attacker. I have one with double fighting and he seems to perform pretty well against Blissey and Snorlax. I think you can get a higher IV one though. The weather system is a great addition to the game and you could easily catch a high Torchic and the candies to make another one.IV's shouldn't be the deciding factor of you powering it up though. If you like this Pokemon and you feel like you would use him, then I say he is probably worth it.
I just find it potentially scary in using TM's on Pokemon like this, since there is no guarantee that you get the move set you want and he may not perform to your standards. It's entirely up to you though! He looks awesome!