Grab this on your way up at intersection A7, at the end of either Le Slalom
or La BR
This trail goes up one of the ski trails of the same name. It's the only practical way of getting up the second half of the mountain all the way to the summit. Apart from a few rocky sections at the beginning and midway, the dirt path is pretty clean and wide open (ski trail, remember), but it's a relatively steep grade all the way up, especially at the end, so it certainly tests your pedaling and cardio limits.
This trail ends at intersection A8, where you have the choice to grab the Le Sommet
Trail on the left to go all the way up to the summit of Mont-Avalanche, or grabbing Pukapab
to go back down.