Hello S1ushie and welcome to Speedrunning! You can submit runs that are done on emulator, but they are hidden by default on the leaderboards(I believe to promote running on official hardware). You can also record DS gameplay without a capture card. Many people hang there phone over a table or chair to do this.

From the mod team as of June 17 2020,

“Hello everyone, the mod team has decided to establish some clear video requirements for the main categories on the speedrun.com leaderboards. All existing runs on the leaderboards below these requirements will be allowed to remain.

In Any%, runs below 20:00 will now require video. In 8 Star, runs below 25:00 will now require video. In 50 Star, runs below 50:00 will now require video. In 80 Star, runs below 1:20:00 will now require video. In 150 Star, runs below 3:15:00 will now require video.

Remember, all forms of quality can be good from a capture card to a webcam, as long as the runs' gameplay is clearly visible”.

It does not matter which language you run on. As far as timesave goes, the language you use doesn’t matter much, but I believe Japanese has the least amount of text boxes in 80 star. If you are looking to save time outside of gameplay, WiiUVC saves about 2min over any type of DS (estimate not final)

You only need the 9999 star bits in bankroad at one time, so after you fill the requirement the first time there is no need to meet it again. As for Star bit collecting, many load files onto their SD card to refill banktoad quickly. I don’t know if there is a level faster than Melty Monster 2 to grind though.

It shows up as a ? Mark above BuBa1 so yes

Is Space Tour going to be added? Collect 1 Star from every galaxy Starts from a completed file