The Colosseum is an amphitheatre which the Romans built in the city of Rome. It was the largest amphitheatre in the Roman Empire. It could seat 50,000 spectators. Amphitheatres were arenas for the gladiatorial games.
Yes, people from all over the world go there to tour it.
Pokemon Colosseum is a game on the Nintendo Gamecube. You might be able to pick it up at a second hand game store or eBay or something like that, but I doubt you could get it brand new.
Most of the time the emperor just sat back and enjoyed the entertainment (it was not always gladiator bouts). However when there were gladiator events, the emperor was generally made the editor of the event as a courtesy. The editor was the man who determined Live, Die, or Tie at the end of the bout.
Trading from Channel to Rubyyou need a cable that has a gamecube wire with it,you can get it at wallmart or toys rus. Trading stuffAs the previous answer states; you do need a gamecube to gameboy advance cable. You also need to make sure that in Pokemon Channel you have unlocked the option to trade jirachi.In Pokemon ruby/sapphire you need to have beaten the elite four and the champion and you need to have saved last in a Pokemon centre.Link the GBA to the gamecube using the aforementioned cable and then turn on the GBA and the gamecube. With Pokemon channel wait for the main menu (don't load the game), go into options and jirachi will be one of them. The game's instruction booklet explains this much betterHope I helped