The places I've worked at (MBB), it's generally just PowerPoint with some add-ons like ThinkCell and Essential Elements, plus some custom macros. For data visualization, we may also use tools like Tableau.
Effective slidewriting is as much about having great communication skills as it is about technical proficiency with the tools.
If you're looking for a good primer, PwC has one on Coursera. Just keep in mind that different firms may have somewhat different philosophies when it comes to building decks, so be prepared to adapt your approach to your firm's guidelines.