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Not really, Garchomp gets boosted evasion making it harder to hit. While Thundurus only gets access to Unmissable Thunder. Either way they each make great threats.
Thanks!! If you want or need any Pokemon don't hesitate to ask me. I like helping people, and at first other people on this site will be hesitant of helping anyone, but once you start establishing yourself people are typically willing to help. :)
NP, I really wish people were nice to me like this when I was new to this site. All I got were the active a**holes of Smogon when I was new. But, your welcome for the help!! :D
If you want I have a Shiny HP Ice Rotom. Though when I trained it I stupidly didn't clone the original. I trained it into a Lv. 64 EVed Wash Rotom. Don't know if you'd want that.