My strongest skill is undoubtedly making overworld sprites. I do it because I really like working with pixel art and animation! It's really cool because you can replace several characters with completely new ones this way (appearance-wise; you still need scripting to make it new!) and to have a completely original hack, you need completely original OW sprites, too.
I developed this skill when I first used Overworld Editor RE (by Hackmew. Thanks so much Hackmew, you're my hero! <3). I had previously dabbled in customizing trainer and pokemon sprites. The only inspiration for this skill I might have had (besides pure creative inspiration from myself) was the Misty sprite from Pokemon Naranja. I keep thinking of how good that was while I'm spriting, and I suppose it's motivation, too. It reminds me that spriting isn't a useless skill, and it gives hacks a unique flair.
And my weakest skills, even though they're kind of off-topic; scripting and mapping. I am really bad at scripting... I need to read more tutorials... and as for mapping, I can map, but a vital part of that is also writing scripts to go with the map. And that's pretty much impossible for me at the moment.
Anyways. Yep.