In reply to MattJ753:
Sarek is famous in Sweden for trekking and wild camping. Its not a common climbing destination, to say the least. Ive never met or know anyone whos been there climbing. To my knowledge there is no guidebok.
Ive been in Sarek a couple of times, both in winter and in summer. I could see how it would be a pretty spectacular place in winter/spring for alpine ridges and that sort of thing. It really has a nice feeling of solitude to it. During our two weeks inside the NP, Feb/March, we didn't meet anyone but the warden.
Google Sarektraversen, that seems to be the popular option, meaning it at least gets done a couple of times/decade... The run from Akkha is high class randonne, well over 1000m vertical. Ski touring in Spring is super, endless opportunities. Combine it with the low key ice festival at Stora sjöfallet in late february and you'll have a excellent fortnight.
The swedish mountains are in general loose and
of poor rock quality. Pieripakte and Saitaris has some ridges people have climbed. Skierfe has a pretty steep face with probably better rock quality, it's also been climbed at 6-, 200m.