Style
Nice and chunky. The presentation isn't outstanding but all the basics are here to let the reader know what's what. Nice writing style that's informal enough to be enjoyable and isn't overly detailed either. I think more effort could have been put into polishing up the overall appearance of this RMT, but I award a sturdy 12/15 for style.
Content
I feel as though the introduction isn't really explaining anything about the nature of the team nor leading the reader into the RMT, so it feels a bit redundant. That said, the team building process and team member explanations feel adequate enough. Your threat list is a little lacking. I think it'd be interesting to see possible changes to the team that can be introduced to amend these threats. I award 15/20 for content. The foundation is there, but in general a higher level of detail would make it a more interesting read and easier rate.
Effectiveness of team
I'm uncomfortable with how Magnezone can box you into a corner and force you to be very conservative with your choice of Heatran and Scizor's Choice locked moves, but I don't see anything particularly wrong here. As Heatran is your primary defence against Sun sweepers such as Volcarona and Venusaur, I think a more bulky, non-choiced build would serve you better like you mentioned. Pretty standard fare for weatherless, but it's a solid enough team. I'll award 12/15 for effectiveness.
Total: 39/50