What is it you would like see customized/made?
The ability to make mods that change client-side strings for species and trainer names, for example to make a mod that uses the original names of trainers and monsters.
Also possibly the ability to change text labels in dialogue (rewriting what NPCs say, basically).
How would you like to see it customized/made?
Just a layer of the API/mod system that allows people to assign names to items/mons/NPCs.
Reference examples (optional):
Hitokage, Lizardo and Lizardon instead of Charmander, Charmeleon, Charizard
Kasumi instead of Misty
There's plenty more names, but these are the two best examples off the top of my head.