aaaaand you just invalidated the rest of your post.Ways that noobs can win wit little to no skill already exists, it's called weather.
Regardless, Double Team IS a bad strategy. However, we shouldn't be unbanning it. There isn't any reason to introduce more luck into the metagame.
Also Haxrachi is completely different from double team. Jirachi has to spam Iron Head to flinch at all. Pokemon with Double Team can do other things that are much more useful rather than a weak Steel-type move while their opponent is missing at the same time.
Please, people, stop citing Jirachi. It's a terrible argument.