In reply to Jonsa:
For rock climbing:
The basic guidebook for rock climbing is Plaisir West from Filidor, with about 10 crags in the Valais area. The climbs are sport climbs, although some may require a bit of gear. The grade range does cover up to 6b/c but focuses on the lower grades. For one trip, this book might be adequate for you...for example it includes multi-pitch 6c routes at Sanetsch.
Harder routes are in Extrem West from the same publisher and there are also other guidebooks to smaller areas, e.g. Oberwallis from the SAC, you find some details in the UKC logbooks on these.
Pure trad routes are rare to find, although in general there are guidebooks dedicated to "clean climbing", for example the "keepwild! climbs" from Panico Alpinverlag has something promising, but beware that the routes might also not be pure trad.
Richard