It depends on what you mean by "good" and what stage your company is at. If you mean "polished" you can use the templates that come with pitch.com, gamma.app, tome.app, among others. I looked at the pitch decks of famous companies and they were nothing exciting graphically.
If your company is early stage you might not even use the pitch deck much. Investors will just want to talk to you about your idea, so you should have everything memorized. One benefit of having a conversation is that it lets you customize your presentation and respond to objections in real-time.
