Can an arcane trickster rogue use a Pearl of Power in D&D 5e? The explanation of which classes can use a pearl of power does not include rogues.
In order to attune to a pearl of power, you must be a spellcaster. An arcane trickster rogue can cast spells, so they count. So would a drow barbarian. Any spellcaster works.
Requires attunement by a spellcaster
The Dungeon Master's Guide errata changed the text in the Attunement section to specify this. New printings have this on page 136.
If the prerequisite is to be a spellcaster, a creature qualifies if it can cast at least one spell using its traits or features