Hands down the BEST Poutine joint in Montreal! Located right by Parc La Fontaine, this place is open 24H and caters to dine in diners and take out diners. The sit in line up is usually longer while the take out line up is shorter but you can expect to wait a good 10-15 minutes for your Poutine to be ready.
They have a wide variety of options ranging from a classic Poutine to more extravagant choices like La Reggae which has ground beef, guac and banana peppers. If you come in the morning, they also have breakfast Poutines or you can upgrade your breakfast potatoes for a classic Poutine (+$3).
Serving size is quite large for the Poutine. A regular is a good snack size if you order multiple dishes but if you want a meal size to share, the grande is fairly good (especially with all the toppings)!
What I love about this place is not only the delicious Poutine but also the location. It's right next to the park which makes it super easy to grab a Poutine to go and then head to the park for a mini picnic.
A must try in Montreal but be weary of the long line ups in the evening. Also they only take cash or interac and NOT credit.