Whenever I try to use start+select+L+R to reset for skipping cutscenes, my game crashes. I’m playing on the 3ds downloadable version from My Nintendo. What do I do to fix this?

sorry for the (3 year) late reply (this'll probably help others so it shouldnt matter much), you can try use other versions, such as TWMenu++, official cartidges or Wii U's Virtual Console version, which is ran the most. and also IIRC, it was a problem with Luma3DS, https://github.com/LumaTeam/Luma3DS/issues/1095

I guess it should cause on Wii U Virtual Console you can skip all cutscenes but in 3DS or DS ver you can't

No, it was mainly a issue with 3DS mode is still somewhat activated in DS mode, soft reset fucks with luma menu, shit hits the fan and 3DS shat itself, this has also been proven by nds-bootstrap not working. It hasn’t happened with cartridges as far as I am aware so it literally only happened with installed games. This has been fixed by booting via NAND, or enabling game patches. It’s patched in this commit however so crisis averted. This literally only happened because she probably didn’t update Luma3DS probably. This also meant it worked with the DS too. Since these are features normally regulated in DS games.