Curious about the game. What is the recommended emulator to use?

Might be a dumb question but on some runs why is the Chinese flag listed for the wii?

What are the major differences between HD and original TP in terms of speedrunning? Just never heard anyone mention it so im just curious.

What emulators if any are allowed for this game?

Since Any% for this game is pretty short, maybe in the future, other categories could be ran. I'd like to see a 12 shard run, just basically get all 12 shards. I doubt a true 100% category could exist due to the 5 hidden hats but probably also cause nobody runs this game? Idk im just throwing ideas out

Is running the game allowed on Wii cause i've been thinking of doing some runs of this game but i don't have a way to stream from an actual gamecube, only from a Wii.