Start at the Mt Washington trailhead, which is nearby the mt ellinor trailheads. 
it starts off super steep and stays that way the entire time. It starts forested, then there is a scree field crossing. After that, there is another short forested section before coming into a meadow. Then, you continue on another scree field, before starting the scrambling section. You walk up a switchback, and then walk along the ridge for a little while. When almost at the summit, stay right and go around the right side of a boulder, and then the summit is right there.

A 50 km (31 mi) point-to-point route from Beaconsfield to the summit of Mount Royal in Montreal, with roughly 407 m of elevation gain. I created this GPX route for the Mount Royal Summit Quest (MRSQ), a course that's well known among local ultrarunners but deserves to be known far beyond the city — it's arguably one of the most beautiful long routes the island has to offer.