I have 8. Significantly less than normal nintendo games because I was much older when the 3DS came out. As a lid I bought the cheap 10$ games you could find in the supermarket and I got much more picky over time.
sold the two games i had left (mario kart 7 and nintendogs + cats). all of the games i owned were physical copies (eg tomadachi life, pilotwings resort, super mario 3D land, etc). think i had around 8 in total?
Right now I only have New Leaf, Pokémon Sun and Super Mario 3D Land.
I don't even know where all my old games went, I must have sold them regularly. I really miss the (3)DS era, the Switch has so amazing games from all types of devs but the DS really was peak Nintendo.
Luckily I held onto mine over the years and didn't trade them in. I also have a couple of DS games but I didn't list them.
Pokemon Sun & Moon
Pokemon X & Y
Pokemon Alpha Sapphire
Harvest moon Tale of two towns
Story of Seasons
Story of Seasons trio of towns
Super mario bros 2
Mariokart 7
ACNL & Happy Home Designer
Zelda Link between worlds (never played it lmao)
Mario Party Island tour