mhfu how to use toolkit

[barbanium]

By changing colors, do you mean changing the sub-species of a boss monster? (Like from basic [Green] Rathian to Pink Rathian or Gold Rathian)
If so, I think you can do that by using cwcheat codes. I'm not familiar with this "toolkit" so this is what I'm suggesting.

By the way, what are you trying to accomplish from doing this? Increasing hunting records? Obtaining carve materials from different sub-species? I'm assuming you have an agenda because you can naturally fight these sub-species by playing the game and advancing to higher tier quests yet you're asking on how to force change the color of the boss monsters that you can fight right now by using this toolkit. Just curious.