Originally Posted by: mathieurevelbut is there any exercice (or the metronome is supposed to be enough) that helps to get the a better groove[/quote]

Anders does a great job with that in this tutorial on practicing different types of rock rhythms with a metronome.

https://www.guitartricks.com/lesson.php?input=22615

That concept can be applied to any given rhythm pattern.

[quote=mathieurevel]a scattered rythm like in Solos for example where the sequences of notes within the scale is done at a different speed which makes it musical and not 1-2-3-4 etc...

If there is some specific lick or phrase from an existing solo you can use a metronome to loop that phrase over & again at a slow tempo with a metronome. Or you can use the looping & speed features on the video player to repeat that phrase of the solo.

Hope that helps!