You still can. Almost all 3DS games are complete on the cart with no downloads or DLC. The only 3DS game I can think of off the top of my head that does have DLC is Super Smash Bros.
I saw my Soul Calibur II art book on the shelf the other day. I recalled how much I anticipated that game. Now it's 16 years later, Soul Calibur 6 is coming out, and I could not care less.