New update after about 2 months!
Utility
Added:

to Entry Hazards, Stealth Rock (niche)

to Entry Hazards, Spikes (niche)

to Suicide Leads, Screen Setters (niche)
Removed:

from Entry Hazards, Toxic Spikes

from Misc, Trick (Switcheroo)
Offensive Roles
Added:

in Wallbreakers, Special (niche)

in Set-Up Sweepers, Calm Mind (niche)

in Wallbreakers, Special (niche)

in Choice Users, Specs (niche)

in Set-Up Sweepers, Calm Mind (niche)

in Pivot, Flip Turn (niche)

in Priority, Vaccum Wave (niche)

in Priority, Vaccum Wave (niche)

in Set-up Sweepers, Agility (niche)
Removed:

from Choice Users, Choice Scarf

from Set-Up Sweepers, Bulk Up

from Set-Up Sweepers, Nasty Plot
Defensive Roles
Added:

in Walls, Mixed
Weather and Trick Room
Added:

in Sand, Other (niche)

in Trick Room, Abusers

in Trick Room, Abusers
Other:
Moves stuff to niche and vice versa
Removed:

Entirely
Let me know what else you want to be moved or not! (or if I missed something)