Make sure to read all the rules.
Welcome!
For your question, please direct that to the forum for the specific game you’re interested in. There aren’t site-wide rules for things like that.
2DS isn’t a platform on this site because it’s just a part of the 3DS family. For any game, you can run on 2DS and select 3DS.
The top menu bar is currently just a solid green rectangle on my mobile browser at the moment.
What platform is the video on currently? If it’s on YouTube it’s pretty easy to retime it directly from the site.
The easiest way is to use the built in screen recorder. You could either time the run from the recording or have a timer open on a separate device.
I noticed that all the “arcade” runs are listed with the platform being Game Boy Advance, but I couldn’t find a GBA release of this game. Are the runs mislabeled, or is there some obscure GBA release that doesn’t show up on Google?
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I think this is called “alt main pokes.” Samurott and Serperior already have categories, but there’s a forum thread where you can request any Pokémon.
https://www.speedrun.com/pkmngen5ext/full_game#Alt_Main_Pokes_BW
A certain number of runs and a certain number of views don’t stop a game from being trivial.