I'm sure there are a few blogs going around in a similar vein to Deagle's, but that'll be it. And it'll be about double cup specifically, not VGC, which makes it difficult to find.
There's no Japanese Smogon or anything similar really, just a lot of like... hobby blogs usually run by say a group of friends who meet up to play pokémon at an after school club or something. Japanese competitive tends to be more between smaller groups of guys who all know how to play very well, which is probably why you get a lot of varying strategies.
I know me and Ray and probably some other people were scoping out a few Japanese blogs for 2010 season, so they do exist. Just think of them as being a bit like Deagle's blog but Japanese and without walls of text. They're easy enough to work out if you can read Japanese, but there's always google translate too.