Well all the movies would have been on film or in 4k resolution for the later movies if they are distributing them in digital, so all of them should be able to get HD transfers and I believe that will be happening for at least some of the movies in an upcoming Japanese box set. Some of the movies may have had some SD titles/extra animation for the dub but otherwise they are all theoretically available in HD.
Dub wise, Movies 12 and 13 got Blu-Ray releases in Australia, Movies 10 - 14 were shown on Cartoon Network in HD originally (and therefore should be reaired that way) and Movies 4, 5, 6 and 7 have been released on Blu-Ray in the US and Europe. In addition I know movies 2 and 3 are available in HD, but am not sure of the source. It's worth noting movies 4 and 5 have very poor picture quality, though that could be fixable with a better transfer/remastering.
In Japan, Movie 14 has been released on Blu-Ray, and Movie 8 and 10-14 (at least) are shown in HD on TV.
The first movie has been confirmed to be remastered for the box set I mentioned earlier, so that leaves movie 9 as the only one I've never personally been able to find/confirm to be available in HD, but considering movie 8 is, there's no reason it shouldn't be.
In short, nearly all of the movies are in HD - just not all of them easily accessible.
For the TV series, The Lonely
Snover (DP121/S12E16) was the first HD episode and all of them since have been.
Bookmarks