There are several hacks of Colosseum and Gale of Darkness out there
For Colosseum:
1) Mausoleum, which a harder version of the game
2) Redux, which gives better teams for the story opponents
3) Poison Version, which revolves around poison mons
4) Sketch Version, which is a challenge with Smeargle's
For Gale:
1) XG, which is the most known hack
2) Groovy, which revolves around dancing mons and dancing in general, you generally feel like Miror B. in this
3 and 4) Redux and Sketch version of Gale
There is also tool to change trainers for late Macversions, the Windows version is currently on the making being tested in the discord below, if someone could check and tell me their progress i would be glad
https://discord.gg/xCPjjnv 
