I would like to change the default tranfer player fading transition to another transition, so if someone knows how, post here.

Do you mean for transferring maps or into a battle sequence?

If you mean the battle transition then its simple. Just go into the Database, click the System tab, and look for where it says 'Battle Transition Graphic' underneath that there is a box. Select your transition image using that box.

I don't know of a way of changing any transition between maps, unless you event it in with your own resources.

One work around through eventing could be this;

Prepare for Transition
Transfer Player (Next to 'Direction' at the bottom is an option called 'Fading'. Turn OFF)
Execute Transition (When you input this command, it comes up with a choice of different transition effects.)

Whenever you wanted to do a 'Transfer Player' event, you would need to do this. May not be the best way for what you are after, but it is a solution.

Thank you decedent! Now I can make my custom transitions!