What is or are the biggest game for speedrunning, Active community and developers or just active community in general? ╭Ꙭ╮╭Ꙭ╮╭Ꙭ╮

Is having different controllers allowed or not, In emulators where you can use normal controller and not for example Nds controlls? ╭Ꙭ╮

Hello! I am Korea player DORAEBAE! I like to play mostly Nds games such as kirby super star ultra or Sonic rush, I also mostly speedrun Nds games, if any one can help guide me around and show me how I do things here. I would be happy! Also I mostly use google translate to talk T.T